1
|
Jia W, Chen S, Chi S, He Y, Ren L, Wang X. Recent Progress on Tick-Borne Animal Diseases of Veterinary and Public Health Significance in China. Viruses 2022; 14:v14020355. [PMID: 35215952 PMCID: PMC8875255 DOI: 10.3390/v14020355] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 01/31/2022] [Accepted: 02/03/2022] [Indexed: 02/04/2023] Open
Abstract
Ticks and tick-borne diseases pose a growing threat to human and animal health, which has brought great losses to livestock production. With the continuous expansion of human activities and the development of natural resources, there are more and more opportunities for humans to contract ticks and tick-borne pathogens. Therefore, research on ticks and tick-borne diseases is of great significance. This paper reviews recent progress on tick-borne bacterial diseases, viral diseases, and parasitic diseases in China, which provides a theoretical foundation for the research of tick-borne diseases.
Collapse
Affiliation(s)
- Weijuan Jia
- College of Animal Science and Technology, Inner Mongolia Minzu University, Tongliao 028000, China; (W.J.); (S.C.); (Y.H.)
| | - Si Chen
- College of Animal Sciences, Key Lab for Zoonoses Research, Ministry of Education, Jilin University, Changchun 130062, China;
| | - Shanshan Chi
- College of Animal Science and Technology, Inner Mongolia Minzu University, Tongliao 028000, China; (W.J.); (S.C.); (Y.H.)
| | - Yunjiang He
- College of Animal Science and Technology, Inner Mongolia Minzu University, Tongliao 028000, China; (W.J.); (S.C.); (Y.H.)
| | - Linzhu Ren
- College of Animal Sciences, Key Lab for Zoonoses Research, Ministry of Education, Jilin University, Changchun 130062, China;
- Correspondence: (L.R.); (X.W.); Tel.: +86-15924529577 (X.W.)
| | - Xueli Wang
- College of Animal Science and Technology, Inner Mongolia Minzu University, Tongliao 028000, China; (W.J.); (S.C.); (Y.H.)
- Correspondence: (L.R.); (X.W.); Tel.: +86-15924529577 (X.W.)
| |
Collapse
|
2
|
Da Rold G, Obber F, Monne I, Milani A, Ravagnan S, Toniolo F, Sgubin S, Zamperin G, Foiani G, Vascellari M, Drzewniokova P, Castellan M, De Benedictis P, Citterio CV. Clinical Tick-Borne Encephalitis in a Roe Deer (Capreolus capreolus L.). Viruses 2022; 14:v14020300. [PMID: 35215891 PMCID: PMC8875940 DOI: 10.3390/v14020300] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 01/26/2022] [Accepted: 01/28/2022] [Indexed: 11/16/2022] Open
Abstract
Tick-borne encephalitis virus (TBEV) is the causative agent of tick-borne encephalitis (TBE), a severe zoonosis occurring in the Palearctic region mainly transmitted through Ixodes ticks. In Italy, TBEV is restricted to the north-eastern part of the country. This report describes for the first time a case of clinical TBE in a roe deer (Capreolus capreolus L.). The case occurred in the Belluno province, Veneto region, an area endemic for TBEV. The affected roe deer showed ataxia, staggering movements, muscle tremors, wide-base stance of the front limbs, repetitive movements of the head, persistent teeth grinding, hypersalivation and prolonged recumbency. An autopsy revealed no significant lesions to explain the neurological signs. TBEV RNA was detected in the brain by real-time RT-PCR, and the nearly complete viral genome (10,897 nucleotides) was sequenced. Phylogenetic analysis of the gene encoding the envelope protein revealed a close relationship to TBEV of the European subtype, and 100% similarity with a partial sequence (520 nucleotides) of a TBEV found in ticks in the bordering Trento province. The histological examination of the midbrain revealed lymphohistiocytic encephalitis, satellitosis and microgliosis, consistent with a viral etiology. Other viral etiologies were ruled out by metagenomic analysis of the brain. This report underlines, for the first time, the occurrence of clinical encephalitic manifestations due to TBEV in a roe deer, suggesting that this pathogen should be included in the frame of differential diagnoses in roe deer with neurologic disease.
Collapse
Affiliation(s)
- Graziana Da Rold
- U.O. Ecopathology SCT2-Belluno, Istituto Zoprofilattico Sperimentale delle Venezie (IZSVe), Via Cappellari 44/A, 32100 Belluno, Italy; (F.O.); (C.V.C.)
- OIE Collaborating Centre for Diseases at the Animal/Human Interface, Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), Viale dell’Università 10, 35020 Legnaro, Italy; (I.M.); (A.M.); (S.R.); (F.T.); (S.S.); (G.Z.); (G.F.); (M.V.); (P.D.); (M.C.); (P.D.B.)
- Correspondence:
| | - Federica Obber
- U.O. Ecopathology SCT2-Belluno, Istituto Zoprofilattico Sperimentale delle Venezie (IZSVe), Via Cappellari 44/A, 32100 Belluno, Italy; (F.O.); (C.V.C.)
- OIE Collaborating Centre for Diseases at the Animal/Human Interface, Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), Viale dell’Università 10, 35020 Legnaro, Italy; (I.M.); (A.M.); (S.R.); (F.T.); (S.S.); (G.Z.); (G.F.); (M.V.); (P.D.); (M.C.); (P.D.B.)
| | - Isabella Monne
- OIE Collaborating Centre for Diseases at the Animal/Human Interface, Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), Viale dell’Università 10, 35020 Legnaro, Italy; (I.M.); (A.M.); (S.R.); (F.T.); (S.S.); (G.Z.); (G.F.); (M.V.); (P.D.); (M.C.); (P.D.B.)
- Laboratory for Viral Genomics and Trascriptomics, Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), Viale dell’Università 10, 35020 Legnaro, Italy
| | - Adelaide Milani
- OIE Collaborating Centre for Diseases at the Animal/Human Interface, Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), Viale dell’Università 10, 35020 Legnaro, Italy; (I.M.); (A.M.); (S.R.); (F.T.); (S.S.); (G.Z.); (G.F.); (M.V.); (P.D.); (M.C.); (P.D.B.)
- Laboratory for Viral Genomics and Trascriptomics, Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), Viale dell’Università 10, 35020 Legnaro, Italy
| | - Silvia Ravagnan
- OIE Collaborating Centre for Diseases at the Animal/Human Interface, Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), Viale dell’Università 10, 35020 Legnaro, Italy; (I.M.); (A.M.); (S.R.); (F.T.); (S.S.); (G.Z.); (G.F.); (M.V.); (P.D.); (M.C.); (P.D.B.)
- Laboratory of Parasitology Micology and Sanitary Enthomology, Istituto Zooprofilattico Sperimentale delle Venezie, Viale dell’Università 10, 35020 Legnaro, Italy
| | - Federica Toniolo
- OIE Collaborating Centre for Diseases at the Animal/Human Interface, Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), Viale dell’Università 10, 35020 Legnaro, Italy; (I.M.); (A.M.); (S.R.); (F.T.); (S.S.); (G.Z.); (G.F.); (M.V.); (P.D.); (M.C.); (P.D.B.)
- Laboratory of Parasitology Micology and Sanitary Enthomology, Istituto Zooprofilattico Sperimentale delle Venezie, Viale dell’Università 10, 35020 Legnaro, Italy
| | - Sofia Sgubin
- OIE Collaborating Centre for Diseases at the Animal/Human Interface, Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), Viale dell’Università 10, 35020 Legnaro, Italy; (I.M.); (A.M.); (S.R.); (F.T.); (S.S.); (G.Z.); (G.F.); (M.V.); (P.D.); (M.C.); (P.D.B.)
- Laboratory of Parasitology Micology and Sanitary Enthomology, Istituto Zooprofilattico Sperimentale delle Venezie, Viale dell’Università 10, 35020 Legnaro, Italy
| | - Gianpiero Zamperin
- OIE Collaborating Centre for Diseases at the Animal/Human Interface, Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), Viale dell’Università 10, 35020 Legnaro, Italy; (I.M.); (A.M.); (S.R.); (F.T.); (S.S.); (G.Z.); (G.F.); (M.V.); (P.D.); (M.C.); (P.D.B.)
- Laboratory for Viral Genomics and Trascriptomics, Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), Viale dell’Università 10, 35020 Legnaro, Italy
| | - Greta Foiani
- OIE Collaborating Centre for Diseases at the Animal/Human Interface, Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), Viale dell’Università 10, 35020 Legnaro, Italy; (I.M.); (A.M.); (S.R.); (F.T.); (S.S.); (G.Z.); (G.F.); (M.V.); (P.D.); (M.C.); (P.D.B.)
- Histopathology Laboratory, Istituto Zooprofilattico Sperimentale delle Venezie, Viale dell’Universita 10, 35020 Legnaro, Italy
| | - Marta Vascellari
- OIE Collaborating Centre for Diseases at the Animal/Human Interface, Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), Viale dell’Università 10, 35020 Legnaro, Italy; (I.M.); (A.M.); (S.R.); (F.T.); (S.S.); (G.Z.); (G.F.); (M.V.); (P.D.); (M.C.); (P.D.B.)
- Histopathology Laboratory, Istituto Zooprofilattico Sperimentale delle Venezie, Viale dell’Universita 10, 35020 Legnaro, Italy
| | - Petra Drzewniokova
- OIE Collaborating Centre for Diseases at the Animal/Human Interface, Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), Viale dell’Università 10, 35020 Legnaro, Italy; (I.M.); (A.M.); (S.R.); (F.T.); (S.S.); (G.Z.); (G.F.); (M.V.); (P.D.); (M.C.); (P.D.B.)
- Laboratory for Viral Emerging Zoonoses, Istituto Zooprofilattico Sperimentale delle Venezie, Viale dell’Università 10, 35020 Legnaro, Italy
| | - Martina Castellan
- OIE Collaborating Centre for Diseases at the Animal/Human Interface, Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), Viale dell’Università 10, 35020 Legnaro, Italy; (I.M.); (A.M.); (S.R.); (F.T.); (S.S.); (G.Z.); (G.F.); (M.V.); (P.D.); (M.C.); (P.D.B.)
- Laboratory for Viral Emerging Zoonoses, Istituto Zooprofilattico Sperimentale delle Venezie, Viale dell’Università 10, 35020 Legnaro, Italy
| | - Paola De Benedictis
- OIE Collaborating Centre for Diseases at the Animal/Human Interface, Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), Viale dell’Università 10, 35020 Legnaro, Italy; (I.M.); (A.M.); (S.R.); (F.T.); (S.S.); (G.Z.); (G.F.); (M.V.); (P.D.); (M.C.); (P.D.B.)
- Laboratory for Viral Emerging Zoonoses, Istituto Zooprofilattico Sperimentale delle Venezie, Viale dell’Università 10, 35020 Legnaro, Italy
| | - Carlo Vittorio Citterio
- U.O. Ecopathology SCT2-Belluno, Istituto Zoprofilattico Sperimentale delle Venezie (IZSVe), Via Cappellari 44/A, 32100 Belluno, Italy; (F.O.); (C.V.C.)
- OIE Collaborating Centre for Diseases at the Animal/Human Interface, Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), Viale dell’Università 10, 35020 Legnaro, Italy; (I.M.); (A.M.); (S.R.); (F.T.); (S.S.); (G.Z.); (G.F.); (M.V.); (P.D.); (M.C.); (P.D.B.)
| |
Collapse
|
3
|
Abstract
Tick-borne diseases are a growing problem in many parts of the world, and their surveillance and control touch on challenging issues in medical entomology, agricultural health, veterinary medicine, and biosecurity. Spatial approaches can be used to synthesize the data generated by integrative One Health surveillance systems, and help stakeholders, managers, and medical geographers understand the current and future distribution of risk. Here, we performed a systematic review of over 8,000 studies and identified a total of 303 scientific publications that map tick-borne diseases using data on vectors, pathogens, and hosts (including wildlife, livestock, and human cases). We find that the field is growing rapidly, with the major Ixodes-borne diseases (Lyme disease and tick-borne encephalitis in particular) giving way to monitoring efforts that encompass a broader range of threats. We find a tremendous diversity of methods used to map tick-borne disease, but also find major gaps: data on the enzootic cycle of tick-borne pathogens is severely underutilized, and mapping efforts are mostly limited to Europe and North America. We suggest that future work can readily apply available methods to track the distributions of tick-borne diseases in Africa and Asia, following a One Health approach that combines medical and veterinary surveillance for maximum impact.
Collapse
Affiliation(s)
- Catherine A Lippi
- Quantitative Disease Ecology and Conservation (QDEC) Lab, Department of Geography, University of Florida, Gainesville, FL, USA
- Emerging Pathogens Institute, University of Florida, Gainesville, FL, USA
- Corresponding author, e-mail:
| | - Sadie J Ryan
- Quantitative Disease Ecology and Conservation (QDEC) Lab, Department of Geography, University of Florida, Gainesville, FL, USA
- Emerging Pathogens Institute, University of Florida, Gainesville, FL, USA
- College of Life Sciences, University of KwaZulu Natal, Durban, South Africa
| | - Alexis L White
- Quantitative Disease Ecology and Conservation (QDEC) Lab, Department of Geography, University of Florida, Gainesville, FL, USA
- Emerging Pathogens Institute, University of Florida, Gainesville, FL, USA
| | - Holly D Gaff
- Department of Biology, Old Dominion University, Norfolk, VA, USA
- School of Mathematics, Statistics and Computer Science, University of Kwa-Zulu Natal, Durban, South Africa
| | - Colin J Carlson
- Center for Global Health Science and Security, Georgetown University Medical Center, Georgetown University, Washington, DC, USA
- Department of Microbiology and Immunology, Georgetown University Medical Center, Georgetown University, Washington, DC, USA
| |
Collapse
|
4
|
Daodu OB, Eisenbarth A, Schulz A, Hartlaub J, Olopade JO, Oluwayelu DO, Groschup MH. Molecular detection of dugbe orthonairovirus in cattle and their infesting ticks (Amblyomma and Rhipicephalus (Boophilus)) in Nigeria. PLoS Negl Trop Dis 2021; 15:e0009905. [PMID: 34788303 PMCID: PMC8598060 DOI: 10.1371/journal.pntd.0009905] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Accepted: 10/12/2021] [Indexed: 11/27/2022] Open
Abstract
Dugbe orthonairovirus (DUGV), a tick-borne zoonotic arbovirus, was first isolated in 1964 in Nigeria. For over four decades, no active surveillance was conducted to monitor the spread and genetic variation of DUGV. This study detected and genetically characterized DUGV circulating in cattle and their infesting ticks (Amblyomma and Rhipicephalus (Boophilus)) in Kwara State, North-Central Nigeria. Blood and or ticks were collected from 1051 cattle at 31 sampling sites (abattoirs and farms) across 10 local government areas of the State. DUGV detection was carried out by RT-qPCR, and positive samples sequenced and phylogenetically analysed. A total of 11824 ticks, mostly A. variegatum (36.0%) and R. (B.) microplus (63.9%), were obtained with mean tick burden of 12 ticks/cattle. Thirty-four (32 A. variegatum and two R. (B.) microplus) of 4644 examined ticks were DUGV-positive, whereas all of the cattle sera tested negative for DUGV genome. Whole genome sequence (S, M and L segments) and phylogenetic analyses indicate that the positive samples shared up to 99.88% nucleotide identity with and clustered around the Nigerian DUGV prototype strain IbAr 1792. Hence, DUGV with high similarity to the previously characterised strain has been detected in Nigeria. To our knowledge, this is the first report of DUGV in North-Central Nigeria and the most recent information after its last surveillance in 1974.
Collapse
Affiliation(s)
- Oluwafemi Babatunde Daodu
- Department of Veterinary Microbiology, Faculty of Veterinary Medicine, University of Ilorin, Ilorin, Nigeria
| | - Albert Eisenbarth
- Institute of Novel and Emerging Infectious Diseases, Friedrich-Loeffler-Institut, Greifswald–Insel Riems, Germany
- Bundeswehr Hospital Hamburg, Branch Tropical Microbiology and Entomology, Hamburg, Germany
| | - Ansgar Schulz
- Institute of Novel and Emerging Infectious Diseases, Friedrich-Loeffler-Institut, Greifswald–Insel Riems, Germany
| | - Julia Hartlaub
- Institute of Novel and Emerging Infectious Diseases, Friedrich-Loeffler-Institut, Greifswald–Insel Riems, Germany
| | - James Olukayode Olopade
- Department of Veterinary Anatomy, Faculty of Veterinary Medicine, University of Ibadan, Ibadan, Nigeria
| | - Daniel Oladimeji Oluwayelu
- Department of Veterinary Microbiology, Faculty of Veterinary Medicine, University of Ibadan, Ibadan, Nigeria
- Center for Control and Prevention of Zoonoses, Faculty of Veterinary Medicine, University of Ibadan, Ibadan, Nigeria
| | - Martin H. Groschup
- Institute of Novel and Emerging Infectious Diseases, Friedrich-Loeffler-Institut, Greifswald–Insel Riems, Germany
| |
Collapse
|
5
|
Dai S, Deng F, Wang H, Ning Y. Crimean-Congo Hemorrhagic Fever Virus: Current Advances and Future Prospects of Antiviral Strategies. Viruses 2021; 13:v13071195. [PMID: 34206476 PMCID: PMC8310003 DOI: 10.3390/v13071195] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 06/09/2021] [Accepted: 06/18/2021] [Indexed: 02/03/2023] Open
Abstract
Crimean-Congo hemorrhagic fever virus (CCHFV) is a widespread, tick-borne pathogen that causes Crimean-Congo hemorrhagic fever (CCHF) with high morbidity and mortality. CCHFV is transmitted to humans through tick bites or direct contact with patients or infected animals with viremia. Currently, climate change and globalization have increased the transmission risk of this biosafety level (BSL)-4 virus. The treatment options of CCHFV infection remain limited and there is no FDA-approved vaccine or specific antivirals, which urges the identification of potential therapeutic targets and the design of CCHF therapies with greater effort. In this article, we discuss the current progress and some future directions in the development of antiviral strategies against CCHFV.
Collapse
Affiliation(s)
- Shiyu Dai
- State Key Laboratory of Virology and National Virus Resource Center, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China;
| | - Fei Deng
- State Key Laboratory of Virology and National Virus Resource Center, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China;
- Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan 430071, China
- Correspondence: (F.D.); (H.W.); (Y.N.); Tel./Fax: +86-27-8719-8465 (F.D.); +86-27-8719-9353 (H.W.); +86-27-8719-7200 (Y.N.)
| | - Hualin Wang
- State Key Laboratory of Virology and National Virus Resource Center, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China;
- Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan 430071, China
- Correspondence: (F.D.); (H.W.); (Y.N.); Tel./Fax: +86-27-8719-8465 (F.D.); +86-27-8719-9353 (H.W.); +86-27-8719-7200 (Y.N.)
| | - Yunjia Ning
- State Key Laboratory of Virology and National Virus Resource Center, Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan 430071, China;
- Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan 430071, China
- Correspondence: (F.D.); (H.W.); (Y.N.); Tel./Fax: +86-27-8719-8465 (F.D.); +86-27-8719-9353 (H.W.); +86-27-8719-7200 (Y.N.)
| |
Collapse
|
6
|
Talactac MR, Hernandez EP, Hatta T, Yoshii K, Kusakisako K, Tsuji N, Tanaka T. The antiviral immunity of ticks against transmitted viral pathogens. Dev Comp Immunol 2021; 119:104012. [PMID: 33484780 DOI: 10.1016/j.dci.2021.104012] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 01/08/2021] [Accepted: 01/09/2021] [Indexed: 06/12/2023]
Abstract
Ticks, being obligate hematophagous arthropods, are exposed to various blood-borne pathogens, including arboviruses. Consequently, their feeding behavior can readily transmit economically important viral pathogens to humans and animals. With this tightly knit vector and pathogen interaction, the replication and transmission of tick-borne viruses (TBVs) must be highly regulated by their respective tick vectors to avoid any adverse effect on the ticks' biological development and viability. Knowledge about the tick-virus interface, although gaining relevant advances in recent years, is advancing at a slower pace than the scientific developments related to mosquito-virus interactions. The unique and complicated feeding behavior of ticks, compared to that of other blood-feeding arthropods, also limits the studies that would further elaborate the antiviral immunity of ticks against TBVs. Hence, knowledge of molecular and cellular immune mechanisms at the tick-virus interface, will further elucidate the successful viral replication of TBVs in ticks and their effective transmission to human and animal hosts.
Collapse
Affiliation(s)
- Melbourne Rio Talactac
- Department of Clinical and Population Health, College of Veterinary Medicine and Biomedical Sciences, Cavite State University, Cavite, 4122, Philippines
| | - Emmanuel Pacia Hernandez
- Department of Parasitology and Tropical Medicine, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami, Sagamihara, Kanagawa, 252-0374, Japan
| | - Takeshi Hatta
- Department of Parasitology and Tropical Medicine, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami, Sagamihara, Kanagawa, 252-0374, Japan
| | - Kentaro Yoshii
- National Research Center for the Control and Prevention of Infectious Diseases, Nagasaki University, 1-12-4 Sakamoto, Nagasaki, 852-8523, Japan
| | - Kodai Kusakisako
- Laboratory of Veterinary Parasitology, School of Veterinary Medicine, Kitasato University, Towada, Aomori, 034-8628, Japan
| | - Naotoshi Tsuji
- Department of Parasitology and Tropical Medicine, Kitasato University School of Medicine, 1-15-1 Kitasato, Minami, Sagamihara, Kanagawa, 252-0374, Japan
| | - Tetsuya Tanaka
- Laboratory of Infectious Diseases, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima, 890-0065, Japan.
| |
Collapse
|
7
|
Choubdar N, Karimian F, Koosha M, Oshaghi MA. An integrated overview of the bacterial flora composition of Hyalomma anatolicum, the main vector of CCHF. PLoS Negl Trop Dis 2021; 15:e0009480. [PMID: 34106924 PMCID: PMC8216544 DOI: 10.1371/journal.pntd.0009480] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2020] [Revised: 06/21/2021] [Accepted: 05/16/2021] [Indexed: 12/26/2022] Open
Abstract
The microbial flora associated with Hyalomma anatolicum ticks was investigated using culture-dependent (CD) and independent (next generation sequencing, NGS) methods. The bacterial profiles of different organs, development stages, sexes, and of host cattle skins were analyzed using the CD method. The egg and female gut microbiota were investigated using NGS. Fourteen distinct bacterial strains were identified using the CD method, of which Bacillus subtilis predominated in eggs, larval guts and in adult female and male guts, suggesting probable transovarial transmission. Bacillus velezensis and B. subtilis were identified in cattle skin and tick samples, suggesting that skin is the origin of tick bacteria. H.anatolicum males harbour lower bacterial diversity and composition than females. The NGS analysis revealed five different bacterial phyla across all samples, Proteobacteria contributing to >95% of the bacteria. In all, 56611sequences were generated representing 6,023 OTUs per female gut and 421 OTUs per egg. Francisellaceae family and Francisella make up the vast majority of the OTUs. Our findings are consistent with interference between Francisella and Rickettsia. The CD method identified bacteria, such B. subtilis that are candidates for vector control intervention approaches such paratransgenesis whereas NGS revealed high Francisella spp. prevalence, indicating that integrated methods are more accurate to characterize microbial community and diversity.
Collapse
Affiliation(s)
- Nayyereh Choubdar
- Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Fateh Karimian
- Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Mona Koosha
- Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad Ali Oshaghi
- Department of Medical Entomology and Vector Control, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| |
Collapse
|
8
|
Zhang N, Cheng XQ, Deng B, Rui J, Qiu L, Zhao Z, Lin S, Liu X, Xu J, Wang Y, Yang M, Zhu Y, Huang J, Liu C, Liu W, Luo L, Li Z, Li P, Yang T, Li ZF, Liang SY, Wang XC, Hu JL, Chen T. Modelling the transmission dynamics of severe fever with thrombocytopenia syndrome in Jiangsu Province, China. Parasit Vectors 2021; 14:237. [PMID: 33957950 PMCID: PMC8100741 DOI: 10.1186/s13071-021-04732-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 04/21/2021] [Indexed: 12/05/2022] Open
Abstract
BACKGROUND Severe fever with thrombocytopenia syndrome (SFTS) is an emerging infectious disease that is regionally distributed in Asia, with high fatality. Constructing the transmission model of SFTS could help provide clues for disease control and fill the gap in research on SFTS models. METHODS We built an SFTS transmission dynamics model based on the susceptible-exposed-infectious-asymptomatic-recovered (SEIAR) model and the epidemiological characteristics of SFTS in Jiangsu Province. This model was used to evaluate the effect by cutting off different transmission routes and taking different interventions into account, to offer clues for disease prevention and control. RESULTS The transmission model fits the reported data well with a minimum R2 value of 0.29 and a maximum value of 0.80, P < 0.05. Meanwhile, cutting off the environmental transmission route had the greatest effect on the prevention and control of SFTS, while isolation and shortening the course of the disease did not have much effect. CONCLUSIONS The model we have built can be used to simulate the transmission of SFTS to help inform disease control. It is noteworthy that cutting off the environment-to-humans transmission route in the model had the greatest effect on SFTS prevention and control.
Collapse
Affiliation(s)
- Nan Zhang
- Department of Acute Infectious Diseases Control and Prevention, Jiangsu Provincial Centre for Disease Control and Prevention, 172, Jiangsu Rd, Nanjing, 210009, China
| | - Xiao-Qing Cheng
- Department of Acute Infectious Diseases Control and Prevention, Jiangsu Provincial Centre for Disease Control and Prevention, 172, Jiangsu Rd, Nanjing, 210009, China
| | - Bin Deng
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, People's Republic of China
| | - Jia Rui
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, People's Republic of China
| | - Luxia Qiu
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, People's Republic of China
| | - Zeyu Zhao
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, People's Republic of China
| | - Shengnan Lin
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, People's Republic of China
| | - Xingchun Liu
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, People's Republic of China
| | - Jingwen Xu
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, People's Republic of China
| | - Yao Wang
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, People's Republic of China
| | - Meng Yang
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, People's Republic of China
| | - Yuanzhao Zhu
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, People's Republic of China
| | - Jiefeng Huang
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, People's Republic of China
| | - Chan Liu
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, People's Republic of China
| | - Weikang Liu
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, People's Republic of China
| | - Li Luo
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, People's Republic of China
| | - Zhuoyang Li
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, People's Republic of China
| | - Peihua Li
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, People's Republic of China
| | - Tianlong Yang
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, People's Republic of China
| | - Zhi-Feng Li
- Department of Acute Infectious Diseases Control and Prevention, Jiangsu Provincial Centre for Disease Control and Prevention, 172, Jiangsu Rd, Nanjing, 210009, China
| | - Shu-Yi Liang
- Department of Acute Infectious Diseases Control and Prevention, Jiangsu Provincial Centre for Disease Control and Prevention, 172, Jiangsu Rd, Nanjing, 210009, China
| | - Xiao-Chen Wang
- Department of Acute Infectious Diseases Control and Prevention, Jiangsu Provincial Centre for Disease Control and Prevention, 172, Jiangsu Rd, Nanjing, 210009, China
| | - Jian-Li Hu
- Department of Acute Infectious Diseases Control and Prevention, Jiangsu Provincial Centre for Disease Control and Prevention, 172, Jiangsu Rd, Nanjing, 210009, China.
| | - Tianmu Chen
- State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, School of Public Health, Xiamen University, Xiamen, 361102, Fujian, People's Republic of China.
| |
Collapse
|
9
|
Godsey MS, Rose D, Burkhalter KL, Breuner N, Bosco-Lauth AM, Kosoy OI, Savage HM. Experimental Infection of Amblyomma americanum (Acari: Ixodidae) With Bourbon Virus (Orthomyxoviridae: Thogotovirus). J Med Entomol 2021; 58:873-879. [PMID: 33710315 PMCID: PMC7955107 DOI: 10.1093/jme/tjaa191] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Indexed: 05/27/2023]
Abstract
Following the recent discovery of Bourbon virus (BRBV) as a human pathogen, and the isolation of the virus from Amblyomma americanum (L.) collected near the location of a fatal human case, we undertook a series of experiments to assess the laboratory vector competence of this tick species for BRBV. Larval ticks were infected using an immersion technique, and transstadial transmission of virus to the nymphal and then to the adult stages was demonstrated. Transstadially infected nymphs transmitted virus to adult ticks at very high rates during cofeeding, indicating the presence of infectious virus in the saliva of engorging ticks. Vertical transmission by transstadially infected females to their progeny occurred, but at a low rate. Rabbits fed on by infected ticks of all active life stages developed high titers of antibody to the virus, demonstrating host exposure to BRBV antigens/live virus during tick blood feeding. These results demonstrate that A. americanum is a competent vector of BRBV and indicate that cofeeding could be critical for enzootic maintenance.
Collapse
Affiliation(s)
- Marvin S. Godsey
- Arboviral Diseases Branch, Centers for Disease Control and Prevention, 3156 Rampart Road, Fort Collins, CO 80521
| | - Dominic Rose
- Arboviral Diseases Branch, Centers for Disease Control and Prevention, 3156 Rampart Road, Fort Collins, CO 80521
| | - Kristin L. Burkhalter
- Arboviral Diseases Branch, Centers for Disease Control and Prevention, 3156 Rampart Road, Fort Collins, CO 80521
| | - Nicole Breuner
- Arboviral Diseases Branch, Centers for Disease Control and Prevention, 3156 Rampart Road, Fort Collins, CO 80521
| | - Angela M. Bosco-Lauth
- Department of Biomedical Sciences, ARBL, Colorado State University, Fort Collins, CO 80521
| | - Olga I. Kosoy
- Arboviral Diseases Branch, Centers for Disease Control and Prevention, 3156 Rampart Road, Fort Collins, CO 80521
| | - Harry M. Savage
- Arboviral Diseases Branch, Centers for Disease Control and Prevention, 3156 Rampart Road, Fort Collins, CO 80521
| |
Collapse
|
10
|
Kholodilov IS, Belova OA, Morozkin ES, Litov AG, Ivannikova AY, Makenov MT, Shchetinin AM, Aibulatov SV, Bazarova GK, Bell-Sakyi L, Bespyatova LA, Bugmyrin SV, Chernetsov N, Chernokhaeva LL, Gmyl LV, Khaisarova AN, Khalin AV, Klimentov AS, Kovalchuk IV, Luchinina SV, Medvedev SG, Nafeev AA, Oorzhak ND, Panjukova EV, Polienko AE, Purmak KA, Romanenko EN, Rozhdestvenskiy EN, Saryglar AA, Shamsutdinov AF, Solomashchenko NI, Trifonov VA, Volchev EG, Vovkotech PG, Yakovlev AS, Zhurenkova OB, Gushchin VA, Karan LS, Karganova GG. Geographical and Tick-Dependent Distribution of Flavi-Like Alongshan and Yanggou Tick Viruses in Russia. Viruses 2021; 13:458. [PMID: 33799742 PMCID: PMC7998622 DOI: 10.3390/v13030458] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 03/06/2021] [Accepted: 03/08/2021] [Indexed: 02/03/2023] Open
Abstract
The genus Flavivirus includes related, unclassified segmented flavi-like viruses, two segments of which have homology with flavivirus RNA-dependent RNA polymerase NS5 and RNA helicase-protease NS3. This group includes such viruses as Jingmen tick virus, Alongshan virus, Yanggou tick virus and others. We detected the Yanggou tick virus in Dermacentor nuttalli and Dermacentor marginatus ticks in two neighbouring regions of Russia. The virus prevalence ranged from 0.5% to 8.0%. We detected RNA of the Alongshan virus in 44 individuals or pools of various tick species in eight regions of Russia. The virus prevalence ranged from 0.6% to 7.8%. We demonstrated the successful replication of the Yanggou tick virus and Alongshan virus in IRE/CTVM19 and HAE/CTVM8 tick cell lines without a cytopathic effect. According to the phylogenetic analysis, we divided the Alongshan virus into two groups: an Ixodes persulcatus group and an Ixodes ricinus group. In addition, the I. persulcatus group can be divided into European and Asian subgroups. We found amino acid signatures specific to the I. ricinus and I. persulcatus groups and also distinguished between the European and Asian subgroups of the I. persulcatus group.
Collapse
Affiliation(s)
- Ivan S. Kholodilov
- Laboratory of Biology of Arboviruses, “Chumakov Institute of Poliomyelitis and Viral Encephalitides” FSBSI “Chumakov FSC R&D IBP RAS”, 108819 Moscow, Russia; (I.S.K.); (O.A.B.); (A.G.L.); (A.Y.I.); (L.L.C.); (L.V.G.); (A.E.P.); (A.S.Y.)
| | - Oxana A. Belova
- Laboratory of Biology of Arboviruses, “Chumakov Institute of Poliomyelitis and Viral Encephalitides” FSBSI “Chumakov FSC R&D IBP RAS”, 108819 Moscow, Russia; (I.S.K.); (O.A.B.); (A.G.L.); (A.Y.I.); (L.L.C.); (L.V.G.); (A.E.P.); (A.S.Y.)
| | - Evgeny S. Morozkin
- Department of Molecular Diagnostics and Epidemiology, Central Research Institute of Epidemiology, 111123 Moscow, Russia; (E.S.M.); (M.T.M.); (O.B.Z.); (L.S.K.)
| | - Alexander G. Litov
- Laboratory of Biology of Arboviruses, “Chumakov Institute of Poliomyelitis and Viral Encephalitides” FSBSI “Chumakov FSC R&D IBP RAS”, 108819 Moscow, Russia; (I.S.K.); (O.A.B.); (A.G.L.); (A.Y.I.); (L.L.C.); (L.V.G.); (A.E.P.); (A.S.Y.)
| | - Anna Y. Ivannikova
- Laboratory of Biology of Arboviruses, “Chumakov Institute of Poliomyelitis and Viral Encephalitides” FSBSI “Chumakov FSC R&D IBP RAS”, 108819 Moscow, Russia; (I.S.K.); (O.A.B.); (A.G.L.); (A.Y.I.); (L.L.C.); (L.V.G.); (A.E.P.); (A.S.Y.)
| | - Marat T. Makenov
- Department of Molecular Diagnostics and Epidemiology, Central Research Institute of Epidemiology, 111123 Moscow, Russia; (E.S.M.); (M.T.M.); (O.B.Z.); (L.S.K.)
| | - Alexey M. Shchetinin
- Pathogenic Microorganisms Variability Laboratory, Gamaleya Federal Research Centre for Epidemiology and Microbiology, Ministry of Health of the Russian Federation, 123098 Moscow, Russia; (A.M.S.); (V.A.G.)
| | - Sergey V. Aibulatov
- Laboratory of Parasitic Arthropods, Zoological Institute, Russian Academy of Sciences, 199034 St. Petersburg, Russia; (S.V.A.); (A.V.K.); (S.G.M.)
| | - Galina K. Bazarova
- Laboratory of Bacteriology, Altai Antiplague Station of Rospotrebnadzor, 649000 Gorno-Altaisk, Russia;
| | - Lesley Bell-Sakyi
- Department of Infection Biology and Microbiomes, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool L3 5RF, UK;
| | - Liubov A. Bespyatova
- Laboratory for Animal and Plant Parasitology, Institute of Biology of Karelian Research Centre, Russian Academy of Sciences (IB KarRC RAS), 185910 Petrozavodsk, Russia; (L.A.B.); (S.V.B.)
| | - Sergey V. Bugmyrin
- Laboratory for Animal and Plant Parasitology, Institute of Biology of Karelian Research Centre, Russian Academy of Sciences (IB KarRC RAS), 185910 Petrozavodsk, Russia; (L.A.B.); (S.V.B.)
| | - Nikita Chernetsov
- Laboratory of Ornithology, Zoological Institute, Russian Academy of Sciences, 199034 St. Petersburg, Russia;
- Department of Vertebrate Zoology, St. Petersburg State University, 199034 St. Petersburg, Russia
| | - Liubov L. Chernokhaeva
- Laboratory of Biology of Arboviruses, “Chumakov Institute of Poliomyelitis and Viral Encephalitides” FSBSI “Chumakov FSC R&D IBP RAS”, 108819 Moscow, Russia; (I.S.K.); (O.A.B.); (A.G.L.); (A.Y.I.); (L.L.C.); (L.V.G.); (A.E.P.); (A.S.Y.)
| | - Larissa V. Gmyl
- Laboratory of Biology of Arboviruses, “Chumakov Institute of Poliomyelitis and Viral Encephalitides” FSBSI “Chumakov FSC R&D IBP RAS”, 108819 Moscow, Russia; (I.S.K.); (O.A.B.); (A.G.L.); (A.Y.I.); (L.L.C.); (L.V.G.); (A.E.P.); (A.S.Y.)
| | - Anna N. Khaisarova
- Center for Hygiene and Epidemiology in the Ulyanovsk Region, 432005 Ulyanovsk, Russia; (A.N.K.); (A.A.N.); (P.G.V.)
| | - Alexei V. Khalin
- Laboratory of Parasitic Arthropods, Zoological Institute, Russian Academy of Sciences, 199034 St. Petersburg, Russia; (S.V.A.); (A.V.K.); (S.G.M.)
| | - Alexander S. Klimentov
- Laboratory of Biochemistry, “Chumakov Institute of Poliomyelitis and Viral Encephalitides” FSBSI “Chumakov FSC R&D IBP RAS”, 108819 Moscow, Russia;
- Laboratory of Biology and Indication of Arboviruses, Department Ivanovsky Institute of Virology, Gamaleya Federal Research Centre for Epidemiology and Microbiology, Ministry of Health of the Russian Federation, 123098 Moscow, Russia
| | - Irina V. Kovalchuk
- Office of Rospotrebnadzor in the Stavropol Territory, 355008 Stavropol, Russia; (I.V.K.); (N.I.S.)
- Stavropol State Medical University, 355017 Stavropol, Russia
| | | | - Sergey G. Medvedev
- Laboratory of Parasitic Arthropods, Zoological Institute, Russian Academy of Sciences, 199034 St. Petersburg, Russia; (S.V.A.); (A.V.K.); (S.G.M.)
| | - Alexander A. Nafeev
- Center for Hygiene and Epidemiology in the Ulyanovsk Region, 432005 Ulyanovsk, Russia; (A.N.K.); (A.A.N.); (P.G.V.)
| | | | - Elena V. Panjukova
- Institute of Biology, Komi Science Center, Ural Branch of Russian Academy of Sciences, 167982 Syktyvkar, Russia;
| | - Alexandra E. Polienko
- Laboratory of Biology of Arboviruses, “Chumakov Institute of Poliomyelitis and Viral Encephalitides” FSBSI “Chumakov FSC R&D IBP RAS”, 108819 Moscow, Russia; (I.S.K.); (O.A.B.); (A.G.L.); (A.Y.I.); (L.L.C.); (L.V.G.); (A.E.P.); (A.S.Y.)
| | - Kristina A. Purmak
- FBIH “Center for Hygiene and Epidemiology in the Stavropol kray”, 355008 Stavropol, Russia; (K.A.P.); (E.N.R.)
| | - Evgeniya N. Romanenko
- FBIH “Center for Hygiene and Epidemiology in the Stavropol kray”, 355008 Stavropol, Russia; (K.A.P.); (E.N.R.)
| | | | - Anna A. Saryglar
- Infectious Disease Hospital, 667003 Kyzyl, Russia; (N.D.O.); (A.A.S.)
| | - Anton F. Shamsutdinov
- Kazan Scientific Research Institute of Epidemiology and Microbiology of Rospotrebnadzor, 420015 Kazan, Russia; (A.F.S.); (V.A.T.)
| | - Nataliya I. Solomashchenko
- Office of Rospotrebnadzor in the Stavropol Territory, 355008 Stavropol, Russia; (I.V.K.); (N.I.S.)
- FBIH “Center for Hygiene and Epidemiology in the Stavropol kray”, 355008 Stavropol, Russia; (K.A.P.); (E.N.R.)
| | - Vladimir A. Trifonov
- Kazan Scientific Research Institute of Epidemiology and Microbiology of Rospotrebnadzor, 420015 Kazan, Russia; (A.F.S.); (V.A.T.)
- Kazan State Medical Academy—Branch Campus of the FSBEI FPE «Russian Medical Academy of Continuous Postgraduate Education» of the Ministry of Healthcare of the Russian Federation, 420012 Kazan, Russia
| | - Evgenii G. Volchev
- Institute of Living Systems Immanuel Kant Baltic Federal University, 236041 Kaliningrad, Russia;
| | - Pavel G. Vovkotech
- Center for Hygiene and Epidemiology in the Ulyanovsk Region, 432005 Ulyanovsk, Russia; (A.N.K.); (A.A.N.); (P.G.V.)
| | - Alexander S. Yakovlev
- Laboratory of Biology of Arboviruses, “Chumakov Institute of Poliomyelitis and Viral Encephalitides” FSBSI “Chumakov FSC R&D IBP RAS”, 108819 Moscow, Russia; (I.S.K.); (O.A.B.); (A.G.L.); (A.Y.I.); (L.L.C.); (L.V.G.); (A.E.P.); (A.S.Y.)
| | - Olga B. Zhurenkova
- Department of Molecular Diagnostics and Epidemiology, Central Research Institute of Epidemiology, 111123 Moscow, Russia; (E.S.M.); (M.T.M.); (O.B.Z.); (L.S.K.)
| | - Vladimir A. Gushchin
- Pathogenic Microorganisms Variability Laboratory, Gamaleya Federal Research Centre for Epidemiology and Microbiology, Ministry of Health of the Russian Federation, 123098 Moscow, Russia; (A.M.S.); (V.A.G.)
- Faculty of Biology, Lomonosov MSU, 119991 Moscow, Russia
| | - Lyudmila S. Karan
- Department of Molecular Diagnostics and Epidemiology, Central Research Institute of Epidemiology, 111123 Moscow, Russia; (E.S.M.); (M.T.M.); (O.B.Z.); (L.S.K.)
| | - Galina G. Karganova
- Laboratory of Biology of Arboviruses, “Chumakov Institute of Poliomyelitis and Viral Encephalitides” FSBSI “Chumakov FSC R&D IBP RAS”, 108819 Moscow, Russia; (I.S.K.); (O.A.B.); (A.G.L.); (A.Y.I.); (L.L.C.); (L.V.G.); (A.E.P.); (A.S.Y.)
- Institute for Translational Medicine and Biotechnology, Sechenov University, 119146 Moscow, Russia
| |
Collapse
|
11
|
Borde JP, Kaier K, Hehn P, Matzarakis A, Frey S, Bestehorn M, Dobler G, Chitimia-Dobler L. The complex interplay of climate, TBEV vector dynamics and TBEV infection rates in ticks-Monitoring a natural TBEV focus in Germany, 2009-2018. PLoS One 2021; 16:e0244668. [PMID: 33411799 PMCID: PMC7790265 DOI: 10.1371/journal.pone.0244668] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Accepted: 12/14/2020] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND Tick-borne encephalitis (TBE) is the most important tick-borne viral disease in Eurasia and causes disease in humans and in a number of animals, among them dogs and horses. There is still no good correlation between tick numbers, weather conditions and human cases. There is the hypothesis that co-feeding due to simultaneous occurrence of larvae and nymphs may be a factor for the increased transmission of the virus in nature and for human disease. Based on long-term data from a natural TBEV focus, phylogenetic results and meteorological data we sought to challenge this hypothesis. METHODS Ticks from an identified TBE natural focus were sampled monthly from 04/2009 to 12/2018. Ticks were identified and pooled. Pools were tested by RT-qPCR. Positive pools were confirmed by virus isolation and/or sequencing of additional genes (E gene, NS2 gene). Temperature data such as the decadal (10-day) mean daily maximum air temperature (DMDMAT) were obtained from a nearby weather station and statistical correlations between tick occurrence and minimal infection rates (MIR) were calculated. RESULTS In the study period from 04/2009 to 12/2018 a total of 15,530 ticks (2,226 females, 2,268 males, 11,036 nymphs) were collected. The overall MIR in nymphs over the whole period was 77/15,530 (0.49%), ranging from 0.09% (2009) to 1.36% (2015). The overall MIR of female ticks was 0.76% (17/2,226 ticks), range 0.14% (2013) to 3.59% (2016). The overall MIR of males was 0.57% (13/2,268 ticks), range from 0.26% (2009) to 0.97% (2015). The number of nymphs was statistically associated with a later start of spring/vegetation period, indicated by the onset of forsythia flowering. CONCLUSION There was no particular correlation between DMDMAT dynamics in spring and/or autumn and the MIR of nymphs or adult ticks detected. However, there was a positive correlation between the number of nymphs and the number of reported human TBE cases in the following months, but not in the following year. The hypothesis of the importance of co-feeding of larvae and nymphs for the maintenance of transmission cycle of TBEV in nature is not supported by our findings.
Collapse
Affiliation(s)
- Johannes P. Borde
- Division of Infectious Diseases, Department of Medicine II, University of Freiburg Medical Center and Faculty of Medicine, Freiburg i.Br., Germany
- Praxis Dr. J. Borde / Gesundheitszentrum Oberkirch, Oberkirch, Germany
| | - Klaus Kaier
- Institute of Medical Biometry and Statistics, Faculty of Medicine and Medical Center – University of Freiburg, University of Freiburg, Freiburg, Germany
| | - Philip Hehn
- Institute of Medical Biometry and Statistics, Faculty of Medicine and Medical Center – University of Freiburg, University of Freiburg, Freiburg, Germany
| | - Andreas Matzarakis
- Research Centre Human Biometeorology, German Meteorological Service, Freiburg, Germany
| | - Stefan Frey
- Bundeswehr Institute of Microbiology, German National Reference Laboratory for TBEV, München, Germany
| | | | - Gerhard Dobler
- Bundeswehr Institute of Microbiology, German National Reference Laboratory for TBEV, München, Germany
- Parasitology Unit, University of Hohenheim, Stuttgart, Germany
| | - Lidia Chitimia-Dobler
- Bundeswehr Institute of Microbiology, German National Reference Laboratory for TBEV, München, Germany
- Parasitology Unit, University of Hohenheim, Stuttgart, Germany
| |
Collapse
|
12
|
Hua BL, Scholte FEM, Ohlendorf V, Kopp A, Marklewitz M, Drosten C, Nichol ST, Spiropoulou C, Junglen S, Bergeron É. A single mutation in Crimean-Congo hemorrhagic fever virus discovered in ticks impairs infectivity in human cells. eLife 2020; 9:e50999. [PMID: 33084573 PMCID: PMC7652417 DOI: 10.7554/elife.50999] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 10/08/2020] [Indexed: 12/20/2022] Open
Abstract
Crimean-Congo hemorrhagic fever (CCHF) is the most widely distributed tick-borne viral infection in the world. Strikingly, reported mortality rates for CCHF are extremely variable, ranging from 5% to 80% (Whitehouse, 2004). CCHF virus (CCHFV, Nairoviridae) exhibits extensive genomic sequence diversity across strains (Deyde et al., 2006; Sherifi et al., 2014). It is currently unknown if genomic diversity is a factor contributing to variation in its pathogenicity. We obtained complete genome sequences of CCHFV directly from the tick reservoir. These new strains belong to a solitary lineage named Europe 2 that is circumstantially reputed to be less pathogenic than the epidemic strains from Europe 1 lineage. We identified a single tick-specific amino acid variant in the viral glycoprotein region that dramatically reduces its fusion activity in human cells, providing evidence that a glycoprotein precursor variant, present in ticks, has severely impaired function in human cells.
Collapse
Affiliation(s)
- Brian L Hua
- Centers for Disease Control and PreventionAtlantaUnited States
| | | | - Valerie Ohlendorf
- Institute of Virology, Charité-Universitätsmedizin Berlin, corporate member of Free University Berlin, Humboldt-University Berlin, and Berlin Institute of HealthBerlinGermany
- German Center for Infection Research (DZIF)BerlinGermany
| | - Anne Kopp
- Institute of Virology, Charité-Universitätsmedizin Berlin, corporate member of Free University Berlin, Humboldt-University Berlin, and Berlin Institute of HealthBerlinGermany
- German Center for Infection Research (DZIF)BerlinGermany
| | - Marco Marklewitz
- Institute of Virology, Charité-Universitätsmedizin Berlin, corporate member of Free University Berlin, Humboldt-University Berlin, and Berlin Institute of HealthBerlinGermany
- German Center for Infection Research (DZIF)BerlinGermany
| | - Christian Drosten
- Institute of Virology, Charité-Universitätsmedizin Berlin, corporate member of Free University Berlin, Humboldt-University Berlin, and Berlin Institute of HealthBerlinGermany
- German Center for Infection Research (DZIF)BerlinGermany
| | - Stuart T Nichol
- Centers for Disease Control and PreventionAtlantaUnited States
| | | | - Sandra Junglen
- Institute of Virology, Charité-Universitätsmedizin Berlin, corporate member of Free University Berlin, Humboldt-University Berlin, and Berlin Institute of HealthBerlinGermany
- German Center for Infection Research (DZIF)BerlinGermany
| | - Éric Bergeron
- Centers for Disease Control and PreventionAtlantaUnited States
| |
Collapse
|
13
|
Abdiyeva K, Turebekov N, Yegemberdiyeva R, Dmitrovskiy A, Yeraliyeva L, Shapiyeva Z, Nurmakhanov T, Sansyzbayev Y, Froeschl G, Hoelscher M, Zinner J, Essbauer S, Frey S. Vectors, molecular epidemiology and phylogeny of TBEV in Kazakhstan and central Asia. Parasit Vectors 2020; 13:504. [PMID: 33023633 PMCID: PMC7539389 DOI: 10.1186/s13071-020-04362-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Accepted: 09/15/2020] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND In the South of Kazakhstan, Almaty Oblast' (region) is endemic for tick-borne encephalitis, with 0.16-0.32 cases/100,000 population between 2016-2018. The purpose of this study was to determine the prevalence and circulating subtypes of tick-borne encephalitis virus (TBEV) in Almaty Oblast' and Kyzylorda Oblast'. METHODS In 2015 we investigated 2341 ticks from 7 sampling sites for the presence of TBEV. Ticks were pooled in 501 pools and isolated RNA was tested for the presence of TBEV by RT-qPCR. For the positive samples, the E gene was amplified, sequenced and a phylogenetic analysis was carried out. RESULTS A total of 48 pools were TBEV-positive by the RT-qPCR. TBEV-positive ticks were only detected in three districts of Almaty Oblast' and not in Kyzylorda Oblast'. The positive TBEV pools were found within Ixodes persulcatus, Haemaphysalis punctata and Dermacentor marginatus. These tick species prevailed only in Almaty Oblast' whereas in Kyzylorda Oblast' Hyalomma asiaticum and D. marginatus are endemic. The minimum infection rates (MIR) in the sampling sites were 4.4% in Talgar, 2.8% in Tekeli and 1.1% in Yenbekshikazakh, respectively. The phylogenetic analysis of the generated sequences indicates that TBEV strains found in Almaty Oblast' clusters in the Siberian subtype within two different clades. CONCLUSIONS We provided new data about the TBEV MIR in ticks in Almaty Oblast' and showed that TBEV clusters in the Siberian Subtype in two different clusters at the nucleotide level. These results indicate that there are different influences on the circulating TBEV strains in south-eastern Kazakhstan. These influences might be caused by different routes of the virus spread in ticks which might bring different genetic TBEV lineages to Kazakhstan. The new data about the virus distribution and vectors provided here will contribute to an improvement of monitoring of tick-borne infections and timely anti-epidemic measures in Kazakhstan.
Collapse
Affiliation(s)
- Karlygash Abdiyeva
- Center for International Health, Ludwig-Maximilians-Universität, Munich, Germany
- National Scientific Center for Highly Dangerous Infections, Almaty, Kazakhstan
| | - Nurkeldi Turebekov
- Center for International Health, Ludwig-Maximilians-Universität, Munich, Germany
- National Scientific Center for Highly Dangerous Infections, Almaty, Kazakhstan
| | | | | | | | - Zhanna Shapiyeva
- Scientific Practical Center of Sanitary Epidemiological Expertise and Monitoring, Almaty, Kazakhstan
| | - Talgat Nurmakhanov
- National Scientific Center for Highly Dangerous Infections, Almaty, Kazakhstan
| | - Yerlan Sansyzbayev
- National Scientific Center for Highly Dangerous Infections, Almaty, Kazakhstan
| | - Guenter Froeschl
- Center for International Health, Ludwig-Maximilians-Universität, Munich, Germany
- Division of Infectious Diseases and Tropical Medicine, University Hospital, LMU Munich, Munich, Germany
| | - Michael Hoelscher
- Division of Infectious Diseases and Tropical Medicine, University Hospital, LMU Munich, Munich, Germany
| | | | | | - Stefan Frey
- Institute of Microbiology, Munich, Germany
- present Address: Bundeswehr Research Institute for Protective Technologies and CBRN Protection, Munster, Germany
| |
Collapse
|
14
|
Reyes-Ruiz JM, Osuna-Ramos JF, De Jesús-González LA, Palacios-Rápalo SN, Cordero-Rivera CD, Farfan-Morales CN, Hurtado-Monzón AM, Gallardo-Flores CE, Alcaraz-Estrada SL, Salas-Benito JS, del Ángel RM. The Regulation of Flavivirus Infection by Hijacking Exosome-Mediated Cell-Cell Communication: New Insights on Virus-Host Interactions. Viruses 2020; 12:E765. [PMID: 32708685 PMCID: PMC7412163 DOI: 10.3390/v12070765] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 05/30/2020] [Accepted: 06/17/2020] [Indexed: 12/17/2022] Open
Abstract
The arthropod-borne flaviviruses are important human pathogens, and a deeper understanding of the virus-host cell interaction is required to identify cellular targets that can be used as therapeutic candidates. It is well reported that the flaviviruses hijack several cellular functions, such as exosome-mediated cell communication during infection, which is modulated by the delivery of the exosomal cargo of pro- or antiviral molecules to the receiving host cells. Therefore, to study the role of exosomes during flavivirus infections is essential, not only to understand its relevance in virus-host interaction, but also to identify molecular factors that may contribute to the development of new strategies to block these viral infections. This review explores the implications of exosomes in flavivirus dissemination and transmission from the vector to human host cells, as well as their involvement in the host immune response. The hypothesis about exosomes as a transplacental infection route of ZIKV and the paradox effect or the dual role of exosomes released during flavivirus infection are also discussed here. Although several studies have been performed in order to identify and characterize cellular and viral molecules released in exosomes, it is not clear how all of these components participate in viral pathogenesis. Further studies will determine the balance between protective and harmful exosomes secreted by flavivirus infected cells, the characteristics and components that distinguish them both, and how they could be a factor that determines the infection outcome.
Collapse
Affiliation(s)
- José Manuel Reyes-Ruiz
- Department of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), Mexico City 07320, Mexico; (J.M.R.-R.); (J.F.O.-R.); (L.A.D.J.-G.); (S.N.P.-R.); (C.D.C.-R.); (C.N.F.-M.); (A.M.H.-M.); (C.E.G.-F.)
| | - Juan Fidel Osuna-Ramos
- Department of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), Mexico City 07320, Mexico; (J.M.R.-R.); (J.F.O.-R.); (L.A.D.J.-G.); (S.N.P.-R.); (C.D.C.-R.); (C.N.F.-M.); (A.M.H.-M.); (C.E.G.-F.)
| | - Luis Adrián De Jesús-González
- Department of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), Mexico City 07320, Mexico; (J.M.R.-R.); (J.F.O.-R.); (L.A.D.J.-G.); (S.N.P.-R.); (C.D.C.-R.); (C.N.F.-M.); (A.M.H.-M.); (C.E.G.-F.)
| | - Selvin Noé Palacios-Rápalo
- Department of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), Mexico City 07320, Mexico; (J.M.R.-R.); (J.F.O.-R.); (L.A.D.J.-G.); (S.N.P.-R.); (C.D.C.-R.); (C.N.F.-M.); (A.M.H.-M.); (C.E.G.-F.)
| | - Carlos Daniel Cordero-Rivera
- Department of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), Mexico City 07320, Mexico; (J.M.R.-R.); (J.F.O.-R.); (L.A.D.J.-G.); (S.N.P.-R.); (C.D.C.-R.); (C.N.F.-M.); (A.M.H.-M.); (C.E.G.-F.)
| | - Carlos Noe Farfan-Morales
- Department of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), Mexico City 07320, Mexico; (J.M.R.-R.); (J.F.O.-R.); (L.A.D.J.-G.); (S.N.P.-R.); (C.D.C.-R.); (C.N.F.-M.); (A.M.H.-M.); (C.E.G.-F.)
| | - Arianna Mahely Hurtado-Monzón
- Department of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), Mexico City 07320, Mexico; (J.M.R.-R.); (J.F.O.-R.); (L.A.D.J.-G.); (S.N.P.-R.); (C.D.C.-R.); (C.N.F.-M.); (A.M.H.-M.); (C.E.G.-F.)
| | - Carla Elizabeth Gallardo-Flores
- Department of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), Mexico City 07320, Mexico; (J.M.R.-R.); (J.F.O.-R.); (L.A.D.J.-G.); (S.N.P.-R.); (C.D.C.-R.); (C.N.F.-M.); (A.M.H.-M.); (C.E.G.-F.)
| | | | - Juan Santiago Salas-Benito
- Maestría en Ciencias en Biomedicina Molecular, Escuela Nacional de Medicina y Homeopatía, Instituto Politécnico Nacional, Mexico City 07320, Mexico
- Doctorado en Ciencias en Biotecnología, Escuela Nacional de Medicina y Homeopatía, Instituto Politécnico Nacional, Mexico City 07320, Mexico
| | - Rosa María del Ángel
- Department of Infectomics and Molecular Pathogenesis, Center for Research and Advanced Studies (CINVESTAV-IPN), Mexico City 07320, Mexico; (J.M.R.-R.); (J.F.O.-R.); (L.A.D.J.-G.); (S.N.P.-R.); (C.D.C.-R.); (C.N.F.-M.); (A.M.H.-M.); (C.E.G.-F.)
| |
Collapse
|
15
|
Hu YY, Zhuang L, Liu K, Sun Y, Dai K, Zhang XA, Zhang PH, Feng ZC, Li H, Liu W. Role of three tick species in the maintenance and transmission of Severe Fever with Thrombocytopenia Syndrome Virus. PLoS Negl Trop Dis 2020; 14:e0008368. [PMID: 32520966 PMCID: PMC7307786 DOI: 10.1371/journal.pntd.0008368] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 06/22/2020] [Accepted: 05/06/2020] [Indexed: 12/12/2022] Open
Abstract
Severe fever with thrombocytopenia syndrome virus (SFTSV) is a novel phlebovirus in the Bunyaviridae family, causing SFTS with high mortality rate. Haemaphysalis longicornis ticks has been demonstrated as a competent vector of SFTSV by experimental transmission study and field study. However, there has been query whether other tick species that infest human beings in the SFTS endemic regions are capable of transmitting the pathogen. Here by performing experimental transmission study, we compared the capable of transmitting SFTSV among Ixodes sinensis, Ixodes persulcatus and Dermacentor silvarum ticks. The transovarial transmission was seen in the I. sinensis ticks with a rate of 40%, but neither in I. persulcatus nor in D. silvarum ticks. I. sinensis ticks also have the ability to transmit SFTSV horizontally to uninfected mice at 7 days after feeding, but not for I. persalcatus or D. silvarum ticks. In the transstadial transmission of I. persulcatus and D. silvarum ticks, I. persulcatus ticks were tested negative from larvae to adults. But the D. silvarum ticks were tested positive from larvae to nymphs, with the positive rate of 100% (10/10) for engorged larval ticks and 81.25% (13/16) for molted nymphs. However, the mice bitten by SFTSV-infected D. silvarum nymphs were negative for SFTSV detection. Therefore, there is not enough evidence to prove the transstadial transmission of SFTSV in I. persalcatus and D. silvarum ticks. Due to its wide distribution and high fatality rate (16%-30%), severe fever with thrombocytopenia syndrome (SFTS) has been listed in the top 10 priority diseases blueprint by the world health organization (WHO) in 2017. SFTSV is a novel phlebovirus in the Bunyaviridae family, and Haemaphysalis longicornis tick has been demonstrated as a competent vector of SFTSV by experimental transmission study and field study. However, there are many other tick species that infest human beings in the SFTS endemic regions. Therefore, it’s neccessary to query whether these tick species are capable of transmitting SFTSV. The authors found that in addition to H. longicornis ticks, Ixodes sinensis ticks also served as an efficient vector capable of transovarial transmitting SFTSV, therefore posing as a potential threat in causing the circulation of SFTSV. In contrast, Dermacentor silvarum and Ixodes persulcatus ticks might not serve as an efficient vector of transmitting SFTSV. This research will provide important reference for the surveillance of SFTSV and the disease prevention and control.
Collapse
Affiliation(s)
- Yuan-Yuan Hu
- Graduate School of Anhui Medical University, Hefei, P. R. China
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, P. R. China
| | - Lu Zhuang
- Affiliated Bayi Children’s Hospital, The 7th Medical Center of People’s Liberation Amy General Hospital, Beijing, P. R. China
| | - Kun Liu
- School of Public Health, Air Force Medical University, Xi’an, Shaanxi, P. R. China
| | - Yi Sun
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, P. R. China
| | - Ke Dai
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, P. R. China
| | - Xiao-Ai Zhang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, P. R. China
| | - Pan-He Zhang
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, P. R. China
| | - Zhi-Chun Feng
- Affiliated Bayi Children’s Hospital, The 7th Medical Center of People’s Liberation Amy General Hospital, Beijing, P. R. China
| | - Hao Li
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, P. R. China
- * E-mail: (HL); (WL)
| | - Wei Liu
- Graduate School of Anhui Medical University, Hefei, P. R. China
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, P. R. China
- * E-mail: (HL); (WL)
| |
Collapse
|
16
|
Khalaf L, Timm A, Chuang WP, Enders L, Hefley TJ, Smith CM. Modeling Aceria tosichella biotype distribution over geographic space and time. PLoS One 2020; 15:e0233507. [PMID: 32469925 PMCID: PMC7259573 DOI: 10.1371/journal.pone.0233507] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Accepted: 05/06/2020] [Indexed: 11/29/2022] Open
Abstract
The wheat curl mite, Aceria tosichella Keifer, one of the most destructive arthropod pests of bread wheat worldwide, inflicts significant annual reductions in grain yields. Moreover, A. tosichella is the only vector for several economically important wheat viruses in the Americas, Australia and Europe. To date, mite-resistant wheat genotypes have proven to be one of the most effective methods of controlling the A. tosichella—virus complex. Thus, it is important to elucidate A. tosichella population genetic structure, in order to better predict improved mite and virus management. Two genetically distinct A. tosichella lineages occur as pests of wheat in Australia, Europe, North America, South America and the Middle East. These lineages are known as type 1 and type 2 in Australia and North America and in Europe and South America as MT-8 and MT-1, respectively. Type 1 and type 2 mites in Australia and North America are delineated by internal transcribed spacer 1 region (ITS1) and cytochrome oxidase I region (COI) sequence differences. In North America, two A. tosichella genotypes known as biotypes are recognized by their response to the Cmc3 mite resistance gene in wheat. Aceria tosichella biotype 1 is susceptible to Cmc3 and biotype 2 is virulent to Cmc3. In this study, ITS1 and COI sequence differences in 25 different populations of A. tosichella of known biotype 1 or biotype 2 composition were characterized for ITS1 and COI sequence differences and used to model spatio-temporal dynamics based on biotype prevalence. Results showed that the proportion of biotype 1 and 2 varies both spatially and temporally. Greater ranges of cropland and grassland within 5000m of the sample site, as well as higher mean monthly precipitation during the month prior to sampling appear to reduce the probability of occurrence of biotype 1 and increase the probability of occurrence of biotype 2. The results suggest that spatio-temporal modeling can effectively improve A. tosichella management. Continual integration of additional current and future precipitation and ground cover data into the existing model will further improve the accuracy of predicting the occurrence of A. tosichella in annual wheat crops, allowing producers to make informed decisions about the selection of varieties with different A. tosichella resistance genes.
Collapse
Affiliation(s)
- Luaay Khalaf
- Department of Entomology, Kansas State University, Manhattan, Kansas, United States of America
- Department of Plant Protection, College of Agriculture, University of Baghdad, Baghdad, Iraq
| | - Alicia Timm
- Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, Colorado, United States of America
| | - Wen-Po Chuang
- Department of Agronomy, National Taiwan University, Taipei, Taiwan
| | - Laramy Enders
- Department of Entomology, Purdue University, West Lafayette, Indiana, United States of America
| | - T. J. Hefley
- Department of Statistics, Kansas State University, Manhattan, Kansas, United States of America
| | - C. Michael Smith
- Department of Entomology, Kansas State University, Manhattan, Kansas, United States of America
- * E-mail:
| |
Collapse
|
17
|
Gethmann J, Hoffmann B, Kasbohm E, Süss J, Habedank B, Conraths FJ, Beer M, Klaus C. Research paper on abiotic factors and their influence on Ixodes ricinus activity-observations over a two-year period at several tick collection sites in Germany. Parasitol Res 2020; 119:1455-1466. [PMID: 32219549 PMCID: PMC7184057 DOI: 10.1007/s00436-020-06666-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Accepted: 03/15/2020] [Indexed: 12/22/2022]
Abstract
Tick-borne diseases are a public health issue. To predict vector tick abundance and activity, it is necessary to understand the driving factors for these variables. In this study, the activity of Ixodes ricinus was investigated in forest and meadow habitats in Germany with a focus on abiotic factors. Ixodes ricinus adults, nymphs and larvae were caught by flagging over a period of 2 years. Microclimatic and weather conditions were recorded at the collection sites. Statistical models were applied to describe correlations between abiotic factors and tick activity in univariable and multivariable analyses. Tick activity was observed in a broad range of air temperature between 3 and 28 °C, and air humidity varied between 35 and 95%. In general, tick activity of nymphs and larvae was higher in forest habitats than that in meadows. With the exception of a single specimen of Dermacentor reticulatus, all ticks were Ixodes ricinus, most of them nymphs (63.2% in 2009 and 75.2% in 2010). For the latter, a negative binomial mixed-effects model fitted best to the observed parameters. The modelling results showed an activity optimum between 20 and 23 °C for air temperature and between 13 and 15 °C for ground temperature. In univariable analyses, the collection site, month, season, ground and air temperature were significant factors for the number of ticks caught and for all life stages. In the multivariable analysis, temperature, season and habitat turned out to be key drivers. Ixodes ricinus positive for RNA of tick-borne encephalitis virus was only found at a single sampling site. The results of this study can be used in risk assessments and to parameterise predictive models.
Collapse
Affiliation(s)
- Jörn Gethmann
- Friedrich-Loeffler-Institut, Institute of Epidemiology, Südufer 10, D-17493, Greifswald-Insel Riems, Germany
| | - Bernd Hoffmann
- Friedrich-Loeffler-Institut, Institute of Diagnostic Virology, Südufer 10, D-17493, Greifswald-Insel Riems, Germany
| | - Elisa Kasbohm
- Friedrich-Loeffler-Institut, Institute of Epidemiology, Südufer 10, D-17493, Greifswald-Insel Riems, Germany
- Institute of Mathematics and Computer Science, University of Greifswald, Walther-Rathenau-Str. 47, 17489, Greifswald, Germany
| | - Jochen Süss
- Friedrich-Loeffler-Institut, Institute of Bacterial Infections and Zoonoses, Naumburger Str. 96a, D-07743, Jena, Germany
- Brehm Memorial Center, Dorfstraße 22, 07646, Renthendorf, Germany
| | - Birgit Habedank
- Umweltbundesamt (German Environment Agency), Health Pests and their Control, Corrensplatz 1, 14195, Berlin, Germany
| | - Franz J Conraths
- Friedrich-Loeffler-Institut, Institute of Epidemiology, Südufer 10, D-17493, Greifswald-Insel Riems, Germany
| | - Martin Beer
- Friedrich-Loeffler-Institut, Institute of Diagnostic Virology, Südufer 10, D-17493, Greifswald-Insel Riems, Germany
| | - Christine Klaus
- Friedrich-Loeffler-Institut, Institute of Bacterial Infections and Zoonoses, Naumburger Str. 96a, D-07743, Jena, Germany.
| |
Collapse
|
18
|
Yañez O, Chávez-Galarza J, Tellgren-Roth C, Pinto MA, Neumann P, de Miranda JR. The honeybee (Apis mellifera) developmental state shapes the genetic composition of the deformed wing virus-A quasispecies during serial transmission. Sci Rep 2020; 10:5956. [PMID: 32249797 PMCID: PMC7136270 DOI: 10.1038/s41598-020-62673-w] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 03/17/2020] [Indexed: 11/23/2022] Open
Abstract
The main biological threat to the western honeybee (Apis mellifera) is the parasitic mite Varroa destructor, largely because it vectors lethal epidemics of honeybee viruses that, in the absence of this mite, are relatively innocuous. The severe pathology is a direct consequence of excessive virus titres caused by this novel transmission route. However, little is known about how the virus adapts genetically during transmission and whether this influences the pathology. Here, we show that upon injection into honeybee pupae, the deformed wing virus type-A (DWV-A) quasispecies undergoes a rapid, extensive expansion of its sequence space, followed by strong negative selection towards a uniform, common shape by the time the pupae have completed their development, with no difference between symptomatic and asymptomatic adults in either DWV titre or genetic composition. This suggests that the physiological and molecular environment during pupal development has a strong, conservative influence on shaping the DWV-A quasispecies in emerging adults. There was furthermore no evidence of any progressive adaptation of the DWV-A quasispecies to serial intra-abdominal injection, simulating mite transmission, despite the generation of ample variation immediately following each transmission, suggesting that the virus either had already adapted to transmission by injection, or was unaffected by it.
Collapse
Affiliation(s)
- Orlando Yañez
- Institute of Bee Health, Vetsuisse Faculty, University of Bern, Bern, CH-3000, Switzerland
| | - Julio Chávez-Galarza
- Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Sta. Apolónia, 5300-253, Bragança, Portugal
- Instituto Nacional de Innovación Agraria (INIA), Av. La Molina, 1981, Lima, Perú
| | | | - M Alice Pinto
- Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Sta. Apolónia, 5300-253, Bragança, Portugal
| | - Peter Neumann
- Institute of Bee Health, Vetsuisse Faculty, University of Bern, Bern, CH-3000, Switzerland
| | - Joachim R de Miranda
- Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, 750 07, Sweden.
| |
Collapse
|
19
|
Lernout T, De Regge N, Tersago K, Fonville M, Suin V, Sprong H. Prevalence of pathogens in ticks collected from humans through citizen science in Belgium. Parasit Vectors 2019; 12:550. [PMID: 31752967 PMCID: PMC6873681 DOI: 10.1186/s13071-019-3806-z] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Accepted: 11/12/2019] [Indexed: 01/17/2023] Open
Abstract
BACKGROUND In order to evaluate the risk of human exposure to tick-borne pathogens in Belgium, a study on the prevalence of several pathogens was conducted on feeding ticks removed from humans in 2017. METHODS Using a citizen science approach based on an existing notification tool for tick bites, a sample of ticks was collected across the country. Collected ticks were screened by PCR for the presence of the following pathogens: Anaplasma phagocytophilum, Babesia spp., Borrelia burgdorferi (sensu lato), Borrelia miyamotoi, Neoehrlichia mikurensis, Rickettsia helvetica and tick-borne encephalitis virus (TBEV). RESULTS In total, 1599 ticks were included in the sample. The great majority of ticks belonged to Ixodes ricinus (99%); other tick species were identified as Ixodes hexagonus (0.7%) and Dermacentor reticulatus (0.3%). Borrelia burgdorferi (s.l.) was detected in 14% of nymphs and adult ticks. Adult ticks (20%) were more likely to be infected than nymphs (12%). The most common genospecies were B. afzelii (52%) and B. garinii (21%). Except for TBEV, the other tick-borne pathogens studied were all detected in the tick sample, although at a lower prevalence: 1.5% for Babesia spp.; 1.8% for A. phagocytophilum; 2.4% for B. miyamotoi; 2.8% for N. mikurensis; and 6.8% for R. helvetica. Rickettsia raoultii, the causative agent of tick-borne lymphadenopathy, was identified for the first time in Belgium, in two out of five D. reticulatus ticks. Co-infections were found in 3.9% of the examined ticks. The most common co-infection was B. burgdorferi (s.l.) + N. mikurensis. CONCLUSIONS Although for most of the tick-borne diseases in Belgium, other than Lyme borreliosis, no or few cases of human infection are reported, the pathogens causing these diseases were all (except for TBEV) detected in the tick study sample. Their confirmed presence can help raise awareness among citizens and health professionals in Belgium on possible diseases other than Lyme borreliosis in patients presenting fever or other non-characteristic symptoms after a tick bite.
Collapse
Affiliation(s)
- Tinne Lernout
- Sciensano, Belgian Institute for Health, Brussels, Belgium
| | - Nick De Regge
- Sciensano, Belgian Institute for Health, Brussels, Belgium
| | | | - Manoj Fonville
- Centre for Infectious Disease Control, National Institute for Public Health and Environment (RIVM), Bilthoven, The Netherlands
| | - Vanessa Suin
- Sciensano, Belgian Institute for Health, Brussels, Belgium
| | - Hein Sprong
- Centre for Infectious Disease Control, National Institute for Public Health and Environment (RIVM), Bilthoven, The Netherlands
| |
Collapse
|
20
|
Ryabov EV, Childers AK, Lopez D, Grubbs K, Posada-Florez F, Weaver D, Girten W, vanEngelsdorp D, Chen Y, Evans JD. Dynamic evolution in the key honey bee pathogen deformed wing virus: Novel insights into virulence and competition using reverse genetics. PLoS Biol 2019; 17:e3000502. [PMID: 31600204 PMCID: PMC6805011 DOI: 10.1371/journal.pbio.3000502] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 10/22/2019] [Accepted: 09/20/2019] [Indexed: 12/23/2022] Open
Abstract
The impacts of invertebrate RNA virus population dynamics on virulence and infection outcomes are poorly understood. Deformed wing virus (DWV), the main viral pathogen of honey bees, negatively impacts bee health, which can lead to colony death. Despite previous reports on the reduction of DWV diversity following the arrival of the parasitic mite Varroa destructor, the key DWV vector, we found high genetic diversity of DWV in infested United States honey bee colonies. Phylogenetic analysis showed that divergent US DWV genotypes are of monophyletic origin and were likely generated as a result of diversification after a genetic bottleneck. To investigate the population dynamics of this divergent DWV, we designed a series of novel infectious cDNA clones corresponding to coexisting DWV genotypes, thereby devising a reverse-genetics system for an invertebrate RNA virus quasispecies. Equal replication rates were observed for all clone-derived DWV variants in single infections. Surprisingly, individual clones replicated to the same high levels as their mixtures and even the parental highly diverse natural DWV population, suggesting that complementation between genotypes was not required to replicate to high levels. Mixed clone–derived infections showed a lack of strong competitive exclusion, suggesting that the DWV genotypes were adapted to coexist. Mutational and recombination events were observed across clone progeny, providing new insights into the forces that drive and constrain virus diversification. Accordingly, our results suggest that Varroa influences DWV dynamics by causing an initial selective sweep, which is followed by virus diversification fueled by negative frequency-dependent selection for new genotypes. We suggest that this selection might reflect the ability of rare lineages to evade host defenses, specifically antiviral RNA interference (RNAi). In support of this hypothesis, we show that RNAi induced against one DWV strain is less effective against an alternate strain from the same population. Deformed wing virus, a key pathogen of honey bees, shows rapid diversification after genetic bottlenecks; a novel reverse-genetic system provides insights into the forces that shape virus diversity, suggesting that virus quasi-species diversification may be driven by selection of genotypes capable of evading host RNAi defences.
Collapse
Affiliation(s)
- Eugene V. Ryabov
- Bee Research Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, USDA, Beltsville, Maryland, United States of America
- * E-mail: ,
| | - Anna K. Childers
- Bee Research Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, USDA, Beltsville, Maryland, United States of America
| | - Dawn Lopez
- Bee Research Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, USDA, Beltsville, Maryland, United States of America
| | - Kyle Grubbs
- Bee Research Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, USDA, Beltsville, Maryland, United States of America
| | - Francisco Posada-Florez
- Bee Research Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, USDA, Beltsville, Maryland, United States of America
| | - Daniel Weaver
- Bee Research Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, USDA, Beltsville, Maryland, United States of America
- Beeweaver Apiaries, Navasota, Texas, United States of America
| | - William Girten
- Bee Research Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, USDA, Beltsville, Maryland, United States of America
- Department of Chemistry, Fort Lewis College, Durango, Colorado, United States of America
| | - Dennis vanEngelsdorp
- Department of Entomology, University of Maryland, College Park, Maryland, United States of America
| | - Yanping Chen
- Bee Research Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, USDA, Beltsville, Maryland, United States of America
| | - Jay D. Evans
- Bee Research Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, USDA, Beltsville, Maryland, United States of America
| |
Collapse
|
21
|
Andrade DJD, Ribeiro EB, de Morais MR, Zanardi OZ. Bioactivity of an oxymatrine-based commercial formulation against Brevipalpus yothersi Baker and its effects on predatory mites in citrus groves. Ecotoxicol Environ Saf 2019; 176:339-345. [PMID: 30953999 DOI: 10.1016/j.ecoenv.2019.03.118] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 03/27/2019] [Accepted: 03/29/2019] [Indexed: 06/09/2023]
Abstract
The acaricidal bioactivity of an oxymatrine-based commercial formulation against Brevipalpus yothersi Baker (Acari: Tenuipalpidae), a vector mite of the Citrus leprosis virus (CiLV), and its impact on predatory mites were assessed. For this purpose, laboratory and field assays using bioacaricide concentrations ranging from 0.5 to 2.0 mg L-1 of oxymatrine were performed during the years from 2015 to 2016. Laboratory results showed that the oxymatrine-based commercial formulation does not cause deleterious effects on B. yothersi eggs; however, it causes high larval mortality. For adult females, the bioacaricide caused high acute toxicity and residual effect for at least 5 days after application. In the field, the bioacaricide exhibited high acaricidal activity against B. yothersi, with efficacy levels similar to that of synthetic acaricide spirodiclofen (48 mg L-1) until 49 days after the application. The application of the bioacaricide did not negatively affect the population levels of phytoseiid predatory mites. Therefore, our results suggest that the oxymatrine-based commercial formulation is an important tool for management of the citrus leprosis mite in citrus groves.
Collapse
Affiliation(s)
- Daniel Júnior de Andrade
- Department of Plant Protection, College of Agricultural and Veterinary Sciences, São Paulo State University (UNESP/FCAV), 14884-900, Jaboticabal, São Paulo, Brazil.
| | - Edenilson Batista Ribeiro
- Department of Plant Science and Animal Science, State University of the Southwest of Bahia (UESB), 45700-000, Vitória da Conquista, Bahia, Brazil
| | - Matheus Rovere de Morais
- Department of Plant Protection, College of Agricultural and Veterinary Sciences, São Paulo State University (UNESP/FCAV), 14884-900, Jaboticabal, São Paulo, Brazil
| | - Odimar Zanuzo Zanardi
- Department of Entomology, Fund for Citrus Protection (FUNDECITRUS), 14807-040, Araraquara, São Paulo, Brazil
| |
Collapse
|
22
|
Makenov M, Karan L, Shashina N, Akhmetshina M, Zhurenkova O, Kholodilov I, Karganova G, Smirnova N, Grigoreva Y, Yankovskaya Y, Fyodorova M. First detection of tick-borne encephalitis virus in Ixodes ricinus ticks and their rodent hosts in Moscow, Russia. Ticks Tick Borne Dis 2019; 10:101265. [PMID: 31447316 DOI: 10.1016/j.ttbdis.2019.101265] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 07/10/2019] [Accepted: 07/28/2019] [Indexed: 12/30/2022]
Abstract
Here, we report the first confirmed autochthonous tick-borne encephalitis case diagnosed in Moscow in 2016 and describe the detection of tick-borne encephalitis virus (TBEV) in ticks and small mammals in a Moscow park. The paper includes data from two patients who were bitten by TBEV-infected ticks in Moscow city; one of these cases led to the development of the meningeal form of TBE. Both TBEV-infected ticks attacked patients in the same area. We collected ticks and trapped small mammals in this area in 2017. All samples were screened for the presence of pathogens causing tick-borne diseases by PCR. The TBEV-positive ticks and small mammals' tissue samples were subjected to virus isolation. The sequencing of the complete polyprotein gene of the positive samples was performed. A total of 227 questing ticks were collected. TBEV was detected in five specimens of Ixodes ricinus. We trapped 44 small mammals, mainly bank voles (Myodes glareolus) and pygmy field mice (Apodemus uralensis). Two samples of brain tissue from bank voles yielded a positive signal in RT-PCR for TBEV. We obtained six virus isolates from the ticks and brain tissue of a bank vole. Complete genome sequencing showed that the obtained isolates belong to the European subtype and have low diversity with sequence identities as high as 99.9%. GPS tracking showed that the maximum distance between the exact locations where the TBEV-positive ticks were collected was 185 m. We assume that the forest park had been free of TBEV and that the virus was recently introduced.
Collapse
Affiliation(s)
- Marat Makenov
- Central Research Institute of Epidemiology, Novogireevskaya st 3-A, 415, Moscow, 111123, Russia.
| | - Lyudmila Karan
- Central Research Institute of Epidemiology, Novogireevskaya st 3-A, 415, Moscow, 111123, Russia
| | - Natalia Shashina
- Sсiеntifiс Rеsеarсh Disinfесtology Institutе, Nauchniy proezd st. 18, Moscow, 117246, Russia
| | - Marina Akhmetshina
- Sсiеntifiс Rеsеarсh Disinfесtology Institutе, Nauchniy proezd st. 18, Moscow, 117246, Russia
| | - Olga Zhurenkova
- Central Research Institute of Epidemiology, Novogireevskaya st 3-A, 415, Moscow, 111123, Russia
| | - Ivan Kholodilov
- Chumakov Institute of Poliomyelitis and Viral Encephalitides (FSBSI "Chumakov FSC R&D IBP RAS), prem. 8, k.17, pos. Institut Poliomyelita, poselenie Moskovskiy, Moscow, 108819, Russia
| | - Galina Karganova
- Chumakov Institute of Poliomyelitis and Viral Encephalitides (FSBSI "Chumakov FSC R&D IBP RAS), prem. 8, k.17, pos. Institut Poliomyelita, poselenie Moskovskiy, Moscow, 108819, Russia; Institute for Translational Medicine and Biotechnology, Sechenov University, Bolshaya Pirogovskaya st, 2, page 4, room 106, Moscow, 119991, Russia
| | - Nina Smirnova
- Central Research Institute of Epidemiology, Novogireevskaya st 3-A, 415, Moscow, 111123, Russia; Lomonosov Moscow State University, Leninskie Gory st. 1-12, MSU, Faculty of Biology, Moscow, 119991, Russia
| | - Yana Grigoreva
- Central Research Institute of Epidemiology, Novogireevskaya st 3-A, 415, Moscow, 111123, Russia
| | - Yanina Yankovskaya
- Pirogov Russian National Research Medical University, Ostrovityanova st. 1, Moscow, 117997, Russia
| | - Marina Fyodorova
- Central Research Institute of Epidemiology, Novogireevskaya st 3-A, 415, Moscow, 111123, Russia
| |
Collapse
|
23
|
Abstract
The invasive mite Varroa destructor has negatively impacted global apiculture, by being a vector for many viruses of the honey bee (Apis mellifera). Until now, most studies have been limited to varroa-honey bee or virus-honey bee interactions. The aim of this study is to bridge the important research gap of varroa-virus interactions by correlating varroa behavior with viral load. Ten-minute video recordings of 200 varroa mites were analyzed, and average speeds of the mites were compared to individual qPCR viral loads for deformed wing virus (DWV) and sacbrood virus (SBV). Statistically significant models reveal that colony, DWV, and SBV all might play a role in mite behavior, suggesting that the varroa-virus interaction needs to be an integral part of future studies on honey bee pathogens.
Collapse
Affiliation(s)
- Carl Giuffre
- Department of Mathematics and Computer Sciences, St. Mary’s College of Southern Maryland, St. Mary’s City, Maryland, United States of America
- * E-mail:
| | - Sharon R. Lubkin
- Department of Mathematics, North Carolina State University, Raleigh, North Carolina, United States of America
| | - David R. Tarpy
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, United States of America
- W.M. Keck Center for Behavioral Biology, North Carolina State University, Raleigh, North Carolina, United States of America
| |
Collapse
|
24
|
Vandegrift KJ, Kapoor A. The Ecology of New Constituents of the Tick Virome and Their Relevance to Public Health. Viruses 2019; 11:v11060529. [PMID: 31181599 PMCID: PMC6630940 DOI: 10.3390/v11060529] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 05/07/2019] [Accepted: 05/29/2019] [Indexed: 01/19/2023] Open
Abstract
Ticks are vectors of several pathogens that can be transmitted to humans and their geographic ranges are expanding. The exposure of ticks to new hosts in a rapidly changing environment is likely to further increase the prevalence and diversity of tick-borne diseases. Although ticks are known to transmit bacteria and viruses, most studies of tick-borne disease have focused upon Lyme disease, which is caused by infection with Borrelia burgdorferi. Until recently, ticks were considered as the vectors of a few viruses that can infect humans and animals, such as Powassan, Tick-Borne Encephalitis and Crimean–Congo hemorrhagic fever viruses. Interestingly, however, several new studies undertaken to reveal the etiology of unknown human febrile illnesses, or to describe the virome of ticks collected in different countries, have uncovered a plethora of novel viruses in ticks. Here, we compared the virome compositions of ticks from different countries and our analysis indicates that the global tick virome is dominated by RNA viruses. Comparative phylogenetic analyses of tick viruses from these different countries reveals distinct geographical clustering of the new tick viruses. Some of these new tick RNA viruses (notably severe fever with thrombocytopenia syndrome virus and Heartland virus) were found to be associated with serious human diseases. Their relevance to public health remains unknown. It is plausible that most of these newly identified tick viruses are of endogenous origin or are restricted in their transmission potential, but the efforts to identify new tick viruses should continue. Indeed, future research aimed at defining the origin, the ecology and the spillover potential of this novel viral biodiversity will be critical to understand the relevance to public health.
Collapse
Affiliation(s)
- Kurt J Vandegrift
- The Center for Infectious Disease Dynamics, Department of Biology, The Pennsylvania State University, University Park, PA 16802, USA.
| | - Amit Kapoor
- Center for Vaccines and Immunity, Research Institute at Nationwide Children's Hospital, Columbus, OH 43205, USA.
- Department of Pediatrics, Ohio State University, Columbus, OH 43205, USA.
| |
Collapse
|
25
|
Zhuang L, Sun Y, Cui XM, Tang F, Hu JG, Wang LY, Cui N, Yang ZD, Huang DD, Zhang XA, Liu W, Cao WC. Transmission of Severe Fever with Thrombocytopenia Syndrome Virus by Haemaphysalis longicornis Ticks, China. Emerg Infect Dis 2019; 24. [PMID: 29664718 PMCID: PMC5938789 DOI: 10.3201/eid2405.151435] [Citation(s) in RCA: 85] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
We demonstrate maintenance and transmission of severe fever with thrombocytopenia syndrome virus by Haemaphysalis longicornis ticks in the larva, nymph, and adult stages with dissemination in salivary gland, midgut, and ovarian tissues. The H. longicornis tick is a competent vector to transmit this virus in both transovarial and transstadial modes.
Collapse
|
26
|
Vakalova EV, Butenko AM, Vishnevskaya TV, Dorofeeva TE, Gitelman AK, Kulikova LN, Lvov DK, Alkhovsky SV. [Results of investigation of ticks in Volga river delta (Astrakhan region, 2017) for Crimean-Congo hemorrhagic fever virus (Nairoviridae, Orthonairovirus, CCHFV) and other tick-borne arboviruses.]. Vopr Virusol 2019; 64:221-228. [PMID: 32167687 DOI: 10.36233/0507-4088-2019-64-5-221-228] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Accepted: 11/28/2019] [Indexed: 06/10/2023]
Abstract
INTRODUCTION There are natural foci of Crimean-Congo hemorrhagic fever (CCHF) that vectored by Hyalomma marginatum ticks in Volga river delta (Astrakhan region, South of Russia). The circulation of Dhori virus (DHOV) (Thogotovirus: Orthomyxoviridae) has been also shown here. We hypothesized that other tick-borne arboviruses are also likely to circulate in the region. In particular, Bhanja virus (Phlebovirus: Phenuiviridae), Wad Medani virus (Orbivirus: Reoviridae), and Tamdy virus (Orthonairovirus: Nairoviridae), which were found to circulate in neighboring regions and are vectored by Haemaphysalis spp., Dermacenter spp., and Hyalomma spp. ticks. OBJECTIVES The aim of the study was to examine ixodid ticks in Volga river delta for the presence of CCHFV, DHOV, Bhanja virus, Wad Medani virus, and Tamdy virus. MATERIAL AND METHODS Ticks were collected in Volga river delta in 2017. We used molecular genetic methods for the detection and analysis of nucleic acids (PCR, sequencing, phylogenetic analysis). RESULTS We detect CCHFV and DHOV RNA in H. marginatum ticks. The rate of infected H. marginatum ticks was 1.98% for CCHFV and 0.4% for DHOV. The results of genetic analysis showed that found DHOV strains are almost identical (99-100% in the M gene) and forms a separate genetic lineage alongside of Batken virus from Central Asia. At the same time, Bhanja virus, Wad Medani virus, and Tamdy virus were not found in ticks, collected in this region. CONCLUSIONS DHOV is circulating in the natural foci of CCHF in the Volga river delta. The ratio of infection of H. marginatum with CCHFV and DHOV was determined for the first time.
Collapse
Affiliation(s)
- E V Vakalova
- Astrakhan Anti-plague Station, Astrakhan, 414024, Russia
- Astrakhan State Medical University, Astrakhan, 414011, Russia
- A.M. Nichogi Regional Infectious Clinical Hospital, Astrakhan, 414011, Russia
| | - A M Butenko
- D.I. Ivanovsky Institute of Virology National Research Centre for Epidemiology and Microbiology named after the honorary academician N.F. Gamaleya, Moscow, 123098, Russia
| | - T V Vishnevskaya
- D.I. Ivanovsky Institute of Virology National Research Centre for Epidemiology and Microbiology named after the honorary academician N.F. Gamaleya, Moscow, 123098, Russia
| | - T E Dorofeeva
- D.I. Ivanovsky Institute of Virology National Research Centre for Epidemiology and Microbiology named after the honorary academician N.F. Gamaleya, Moscow, 123098, Russia
| | - A K Gitelman
- D.I. Ivanovsky Institute of Virology National Research Centre for Epidemiology and Microbiology named after the honorary academician N.F. Gamaleya, Moscow, 123098, Russia
| | - L N Kulikova
- Center of Hygiene and Epidemiology in Astrakhan region, Astrakhan, 414057, Russia
| | - D K Lvov
- D.I. Ivanovsky Institute of Virology National Research Centre for Epidemiology and Microbiology named after the honorary academician N.F. Gamaleya, Moscow, 123098, Russia
| | - S V Alkhovsky
- D.I. Ivanovsky Institute of Virology National Research Centre for Epidemiology and Microbiology named after the honorary academician N.F. Gamaleya, Moscow, 123098, Russia
| |
Collapse
|
27
|
Hoch T, Breton E, Vatansever Z. Dynamic Modeling of Crimean Congo Hemorrhagic Fever Virus (CCHFV) Spread to Test Control Strategies. J Med Entomol 2018; 55:1124-1132. [PMID: 29618023 DOI: 10.1093/jme/tjy035] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Indexed: 06/08/2023]
Abstract
Crimean Congo hemorrhagic fever is a zoonotic disease which has emerged or re-emerged recently in Eastern Europe and Turkey. The causative agent is a virus, mainly transmitted by ticks of the species Hyalomma marginatum (Koch, 1844, Ixodida, Amblyommidae). To test potential scenarios for the control of pathogen spread, a dynamic mechanistic model has been developed that takes into account the major processes involved in tick population dynamics and pathogen spread. The tick population dynamics model represents both abiotic (meteorological variables) and biotic (hare and cattle densities) factors in the determination of processes (development, host finding, and mortality). The infection model consists of an SIRS model for the host part whereas a lifelong infectiousness was considered for ticks. The model was first applied to a zone in Central Anatolia (Turkey). Simulated dynamics represent the average reported level of infection in vectors and hosts. A sensitivity analysis to parameter value has been carried out and highlighted the role of transstadial transmission as well as acquisition of the pathogen by immature stages. Applying the model to different sites of Turkey shows different patterns in the dynamics of acarological risk (number of infectious questing adults). This model was thereafter used to test control strategies. Simulation results indicate that acaricide treatments and decrease in hare density could have valuable effects when combined, either on the acarological risk or on the prevalence in cattle. The kind of model we have developed provides insight into the ability of different strategies to prevent and control disease spread.
Collapse
Affiliation(s)
- Thierry Hoch
- BIOEPAR, INRA, Oniris, Université Bretagne Loire, Nantes, France
| | - Eric Breton
- BIOEPAR, INRA, Oniris, Université Bretagne Loire, Nantes, France
| | - Zati Vatansever
- Department of Parasitology, Faculty of Veterinary Medicine, Kafkas University, Kars, Turkey
| |
Collapse
|
28
|
Smith K, Oesterle PT, Jardine CM, Dibernardo A, Huynh C, Lindsay R, Pearl DL, Bosco-Lauth AM, Nemeth NM. Powassan Virus and Other Arthropod-Borne Viruses in Wildlife and Ticks in Ontario, Canada. Am J Trop Med Hyg 2018; 99:458-465. [PMID: 29869604 PMCID: PMC6090327 DOI: 10.4269/ajtmh.18-0098] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 04/24/2018] [Indexed: 11/07/2022] Open
Abstract
Powassan virus (POWV) is a tick-borne zoonosis maintained in natural enzootic cycles between ixodid ticks and wild mammals. Reported human cases have increased in recent years; these infections can be fatal or lead to long-term neurologic sequelae. However, both the geographic distribution and the role of common, potential mammalian hosts in POWV transmission are poorly understood, creating challenges to public health surveillance. We looked for evidence of POWV infection among candidate wildlife host species and ticks collected from mammals and birds in southern Ontario. Tissues (including blood) and ticks from trapped wild mammals were collected in the summers of 2015 and 2016. Ticks removed from dogs in 2015-2016 and wildlife diagnostic cases from 2011 to 2013 were also included. Tissue and tick (Ixodes spp.) homogenates were tested for POWV by reverse transcriptase-polymerase chain reaction (RT-PCR). In addition, sera from wild mammals were tested for antibodies to POWV, West Nile virus (WNV), and heartland virus (HRTV) by plaque reduction neutralization test. All 724 tissue samples were negative for POWV by RT-PCR. One of 53 pools of Ixodes cookei (among 98 total tick pools) was RT-PCR positive for deer tick virus (POWV) lineage. Antibodies to POWV and WNV were detected in 0.4% of 265 and 6.1% of 264 samples, respectively, and all of 219 serum samples tested negative for anti-HRTV antibodies. These results reveal low POWV detection rates in southern Ontario, while highlighting the challenges and need for continued efforts into understanding POWV epidemiology and targeted surveillance strategies.
Collapse
Affiliation(s)
- Kathryn Smith
- Department of Pathobiology, University of Guelph, Guelph, Ontario, Canada
- Canadian Wildlife Health Cooperative, University of Guelph, Guelph, Ontario, Canada
| | - Paul T. Oesterle
- Department of Pathobiology, University of Guelph, Guelph, Ontario, Canada
- Canadian Wildlife Health Cooperative, University of Guelph, Guelph, Ontario, Canada
| | - Claire M. Jardine
- Department of Pathobiology, University of Guelph, Guelph, Ontario, Canada
- Canadian Wildlife Health Cooperative, University of Guelph, Guelph, Ontario, Canada
| | - Antonia Dibernardo
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Canada
| | - Chris Huynh
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Canada
| | - Robbin Lindsay
- National Microbiology Laboratory, Public Health Agency of Canada, Winnipeg, Canada
| | - David L. Pearl
- Department of Population Medicine, University of Guelph, Guelph, Ontario, Canada
| | - Angela M. Bosco-Lauth
- Department of Biomedical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, Colorado
| | - Nicole M. Nemeth
- Department of Pathobiology, University of Guelph, Guelph, Ontario, Canada
- Canadian Wildlife Health Cooperative, University of Guelph, Guelph, Ontario, Canada
| |
Collapse
|
29
|
Ramírez de Arellano E, Hernández L, Goyanes MJ, Arsuaga M, Cruz AF, Negredo A, Sánchez-Seco MP. Phylogenetic Characterization of Crimean-Congo Hemorrhagic Fever Virus, Spain. Emerg Infect Dis 2018; 23:2078-2080. [PMID: 29148370 PMCID: PMC5708233 DOI: 10.3201/eid2312.171002] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Two cases of Crimean-Congo hemorrhagic fever were reported in Spain during 2016. We obtained the virus from a patient sample and characterized its full genomic sequence. Phylogenetic analysis indicated that the virus corresponds to the African genotype III, which includes viruses previously found in West and South Africa.
Collapse
MESH Headings
- Animals
- Arachnid Vectors/virology
- Genome, Viral
- Hemorrhagic Fever Virus, Crimean-Congo/classification
- Hemorrhagic Fever Virus, Crimean-Congo/genetics
- Hemorrhagic Fever Virus, Crimean-Congo/isolation & purification
- Hemorrhagic Fever Virus, Crimean-Congo/pathogenicity
- Hemorrhagic Fever, Crimean/diagnosis
- Hemorrhagic Fever, Crimean/pathology
- Hemorrhagic Fever, Crimean/transmission
- Hemorrhagic Fever, Crimean/virology
- Humans
- Phylogeny
- RNA, Viral/genetics
- South Africa
- Spain
- Ticks/virology
- Whole Genome Sequencing
Collapse
|
30
|
Abstract
Bourbon virus (BRBV) was first isolated in 2014 from a resident of Bourbon County, Kansas, USA, who died of the infection. In 2015, an ill Payne County, Oklahoma, resident tested positive for antibodies to BRBV, before fully recovering. We retrospectively tested for BRBV in 39,096 ticks from northwestern Missouri, located 240 km from Bourbon County, Kansas. We detected BRBV in 3 pools of Amblyomma americanum (L.) ticks: 1 pool of male adults and 2 pools of nymphs. Detection of BRBV in A. americanum, a species that is aggressive, feeds on humans, and is abundant in Kansas and Oklahoma, supports the premise that A. americanum is a vector of BRBV to humans. BRBV has not been detected in nonhuman vertebrates, and its natural history remains largely unknown.
Collapse
|
31
|
Abstract
Little is known about the occurrence of tick-borne encephalitis in Romania. Sheep are an infection source for humans and are useful sentinels for risk analysis. We demonstrate high antibody prevalence (15.02%) among sheep used as sentinels for this disease in 80% of the tested localities in 5 counties of northwestern Romania.
Collapse
|
32
|
Savage HM, Godsey MS, Panella NA, Burkhalter KL, Manford J, Trevino-Garrison IC, Straily A, Wilson S, Bowen J, Raghavan RK. Surveillance for Tick-Borne Viruses Near the Location of a Fatal Human Case of Bourbon Virus (Family Orthomyxoviridae: Genus Thogotovirus) in Eastern Kansas, 2015. J Med Entomol 2018; 55:701-705. [PMID: 29365128 DOI: 10.1093/jme/tjx251] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Indexed: 06/07/2023]
Abstract
Bourbon virus (Family Orthomyxoviridae: Genus Thogotovirus) was first isolated from a human case-patient residing in Bourbon County, Kansas, who subsequently died. Before becoming ill in late spring of 2014, the patient reported several tick bites. In response, we initiated tick surveillance in Bourbon County and adjacent southern Linn County during spring and summer of 2015. We collected 20,639 host-seeking ticks representing four species from 12 sites. Amblyomma americanum (L.) (Acari: Ixodidae) and Dermacentor variabilis (Say) (Acari: Ixodidae) accounted for nearly all ticks collected (99.99%). Three tick pools, all composed of adult A. americanum ticks collected in Bourbon County, were virus positive. Two pools were Heartland virus (Family Bunyaviridae: Genus Phlebovirus) positive, and one was Bourbon virus positive. The Bourbon virus positive tick pool was composed of five adult females collected on a private recreational property on June 5. Detection of Bourbon virus in the abundant and aggressive human-biting tick A. americanum in Bourbon County supports the contention that A. americanum is a vector of Bourbon virus to humans. The current data combined with virus detections in Missouri suggest that Bourbon virus is transmitted to humans by A. americanum ticks, including both the nymphal and adult stages, that ticks of this species become infected as either larvae, nymphs or both, perhaps by feeding on viremic vertebrate hosts, by cofeeding with infected ticks, or both, and that Bourbon virus is transstadially transmitted. Multiple detections of Heartland virus and Bourbon virus in A. americanum ticks suggest that these viruses share important components of their transmission cycles.
Collapse
Affiliation(s)
- Harry M Savage
- Arbovirus Diseases Branch, Centers for Disease Control and Prevention, Fort Collins, CO
| | - Marvin S Godsey
- Arbovirus Diseases Branch, Centers for Disease Control and Prevention, Fort Collins, CO
| | - Nicholas A Panella
- Arbovirus Diseases Branch, Centers for Disease Control and Prevention, Fort Collins, CO
| | - Kristen L Burkhalter
- Arbovirus Diseases Branch, Centers for Disease Control and Prevention, Fort Collins, CO
| | - Justin Manford
- College of Veterinary Medicine, Kansas State University, Manhattan, KS
| | | | - Anne Straily
- Kansas Department of Health and Environment, Topeka, KS
| | - Savannah Wilson
- College of Veterinary Medicine, Kansas State University, Manhattan, KS
| | - Jaden Bowen
- Biology Department, Heckert-Wells Hall, Pittsburg State University, Pittsburg, KS
| | - Ram K Raghavan
- College of Veterinary Medicine, Kansas State University, Manhattan, KS
| |
Collapse
|
33
|
Sadanandane C, Gokhale MD, Elango A, Yadav P, Mourya DT, Jambulingam P. Prevalence and spatial distribution of Ixodid tick populations in the forest fringes of Western Ghats reported with human cases of Kyasanur forest disease and monkey deaths in South India. Exp Appl Acarol 2018; 75:135-142. [PMID: 29594846 DOI: 10.1007/s10493-018-0223-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Accepted: 01/20/2018] [Indexed: 06/08/2023]
Abstract
Kyasanur forest disease (KFD) is a major tick-borne viral haemorrhagic fever caused by KFD virus (KFDV) (Flaviviridae). The disease was reported to be confined to five districts of Karnataka state India until 2011. During 2012-2016, emergence of KFD has been reported in newer areas of Karnataka and adjoining states. Therefore, survey of tick vectors was carried out in these new areas of Karnataka and adjoining states reported with monkey deaths and human cases of KFD. In all selected sites, ticks from the forest floor were collected by lint clothes using flagging method. Tick samples were tested for KFDV nucleic acid by real-time RT-PCR. A total of 4772 ticks, comprising eight species of genus Haemaphysalis and one species each of genus Amblyomma, Ixodes and Rhipicephalus was collected. Haemaphysalis spinigera, the principal vector of KFDV was the predominant tick species (59.5%) collected followed by H. turturis (8.6%). The abundance of H. spinigera ranged from 9.2 to 33.9 per man-hour in the six districts surveyed. Of 214 (4418 tick samples) pools screened by real-time RT-PCR, two pools of H. spinigera were positive for KFDV. High abundance of Haemaphysalis vectors in the six districts indicated that the districts are receptive for KFD outbreaks. KFDV was detected in the tick vectors in the new foci of the KFD. Data on tick distribution will be useful in creating KFD risk map for strengthening the ongoing preventive measures such as vaccination and supply of insect repellents to the high risk groups and intensive health education.
Collapse
Affiliation(s)
- C Sadanandane
- Vector Control Research Centre (Indian Council of Medical Research, Ministry of Health and Family Welfare Government of India), Indira Nagar, Pondicherry, 605 006, India
| | - M D Gokhale
- National Institute of Virology (Indian Council of Medical Research, Ministry of Health and Family Welfare Government of India), Pune, Maharashtra, 411 001, India
| | - A Elango
- Vector Control Research Centre (Indian Council of Medical Research, Ministry of Health and Family Welfare Government of India), Indira Nagar, Pondicherry, 605 006, India.
| | - P Yadav
- National Institute of Virology (Indian Council of Medical Research, Ministry of Health and Family Welfare Government of India), Pune, Maharashtra, 411 001, India
| | - D T Mourya
- National Institute of Virology (Indian Council of Medical Research, Ministry of Health and Family Welfare Government of India), Pune, Maharashtra, 411 001, India
| | - P Jambulingam
- Vector Control Research Centre (Indian Council of Medical Research, Ministry of Health and Family Welfare Government of India), Indira Nagar, Pondicherry, 605 006, India
| |
Collapse
|
34
|
Jahfari S, de Vries A, Rijks JM, Van Gucht S, Vennema H, Sprong H, Rockx B. Tick-Borne Encephalitis Virus in Ticks and Roe Deer, the Netherlands. Emerg Infect Dis 2018; 23:1028-1030. [PMID: 28518024 PMCID: PMC5443429 DOI: 10.3201/eid2306.161247] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
We report the presence of tick-borne encephalitis virus (TBEV) in the Netherlands. Serologic screening of roe deer found TBEV-neutralizing antibodies with a seroprevalence of 2%, and TBEV RNA was detected in 2 ticks from the same location. Enhanced surveillance and awareness among medical professionals has led to the identification of autochthonous cases.
Collapse
|
35
|
Spengler JR, Estrada-Peña A. Host preferences support the prominent role of Hyalomma ticks in the ecology of Crimean-Congo hemorrhagic fever. PLoS Negl Trop Dis 2018; 12:e0006248. [PMID: 29420542 PMCID: PMC5821391 DOI: 10.1371/journal.pntd.0006248] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2017] [Revised: 02/21/2018] [Accepted: 01/18/2018] [Indexed: 11/18/2022] Open
Abstract
Crimean-Congo hemorrhagic fever virus (CCHFV) is a tick-borne zoonotic agent that is maintained in nature in an enzootic vertebrate-tick-vertebrate cycle. Hyalomma genus ticks have been implicated as the main CCHFV vector and are key in maintaining silent endemic foci. However, what contributes to their central role in CCHFV ecology is unclear. To assess the significance of host preferences of ticks in CCHFV ecology, we performed comparative analyses of hosts exploited by 133 species of ticks; these species represent 5 genera with reported geographical distribution over the range of CCHFV. We found that the composition of vertebrate hosts on which Hyalomma spp. feed is different than for other tick genera. Immatures of the genus Hyalomma feed preferentially on species of the orders Rodentia, Lagomorpha, and the class Aves, while adults concentrate mainly on the family Bovidae. With the exception of Aves, these hosts include the majority of the vertebrates consistently reported to be viremic upon CCHFV infection. While other tick genera also feed on these hosts, Hyalomma spp. almost completely concentrate their populations on them. Hyalomma spp. feed on less phylogenetically diverse hosts than any other tick genus, implying that this network of hosts has a low resilience. Indeed, removing the most prominent hosts quickly collapsed the network of parasitic interactions. These results support the intermittent activity of CCHFV foci: likely, populations of infected Hyalomma spp. ticks exceed the threshold of contact with humans only when these critical hosts reach adequate population density, accounting for the sporadic occurence of clinical tick-transmitted cases. Our data describe the association of vertebrate host preferences with the role of Hyalomma spp. ticks in maintaining endemic CCHFV foci, and highlight the importance of host-tick dynamics in pathogen ecology.
Collapse
Affiliation(s)
- Jessica R. Spengler
- Viral Special Pathogens Branch, Centers for Disease Control and Prevention, Atlanta, GA, United States of America
| | - Agustin Estrada-Peña
- Department of Animal Health, Faculty of Veterinary Medicine, University of Zaragoza, Zaragoza, Spain
- * E-mail:
| |
Collapse
|
36
|
Belova OA, Litov AG, Kholodilov IS, Kozlovskaya LI, Bell-Sakyi L, Romanova LI, Karganova GG. Properties of the tick-borne encephalitis virus population during persistent infection of ixodid ticks and tick cell lines. Ticks Tick Borne Dis 2017; 8:895-906. [PMID: 28784308 DOI: 10.1016/j.ttbdis.2017.07.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Revised: 07/24/2017] [Accepted: 07/24/2017] [Indexed: 10/19/2022]
Abstract
Tick-borne encephalitis virus (TBEV) is the causative agent of tick-borne encephalitis (TBE), a vector-borne zoonotic neuroinfection. For successful circulation in natural foci the virus has to survive in the vector for a long period of time. Information about the effect of long-term infection of ticks on properties of the viral population is of great importance. In recent years, changes in the eco-epidemiology of TBEV due to changes in distribution of ixodid ticks have been observed. These changes in TBEV-endemic areas could result in a shift of the main tick vector species, which in turn may lead to changes in properties of the virus. In the present study we evaluated the selective pressure on the TBEV population during persistent infection of various species of ticks and tick cell lines. TBEV effectively replicated and formed persistent infection in ticks and tick cell lines of the vector species (Ixodes spp.), potential vectors (Dermacentor spp.) and non-vector ticks (Hyalomma spp.). During TBEV persistence in Ixodes and Dermacentor ticks, properties of the viral population remained virtually unchanged. In contrast, persistent TBEV infection of tick cell lines from both vector and non-vector ticks favoured selection of viral variants with low neuroinvasiveness for laboratory mice and substitutions in the E protein that increased local positive charge of the virion. Thus, selective pressure on viral population may differ in ticks and tick cell lines during persistent infection. Nevertheless, virus variants with properties of the original strain adapted to mouse CNS were not eliminated from the viral population during long-term persistence of TBEV in ticks and tick cell lines.
Collapse
Affiliation(s)
- Oxana A Belova
- Chumakov Institute of Poliomyelitis and Viral Encephalitides (Chumakov FSC R&D IBP RAS), prem. 8, k.17, pos. Institut Poliomyelita, poselenie Moskovskiy, Moscow, 108819, Russia.
| | - Alexander G Litov
- Chumakov Institute of Poliomyelitis and Viral Encephalitides (Chumakov FSC R&D IBP RAS), prem. 8, k.17, pos. Institut Poliomyelita, poselenie Moskovskiy, Moscow, 108819, Russia; Lomonosov MSU, Faculty of Biology, Lenin Hills, 1/12, Moscow, 119234, Russia.
| | - Ivan S Kholodilov
- Chumakov Institute of Poliomyelitis and Viral Encephalitides (Chumakov FSC R&D IBP RAS), prem. 8, k.17, pos. Institut Poliomyelita, poselenie Moskovskiy, Moscow, 108819, Russia.
| | - Liubov I Kozlovskaya
- Chumakov Institute of Poliomyelitis and Viral Encephalitides (Chumakov FSC R&D IBP RAS), prem. 8, k.17, pos. Institut Poliomyelita, poselenie Moskovskiy, Moscow, 108819, Russia; I.M. Sechenov First Moscow State Medical University of the Ministry of Health of the Russian Federation (Sechenov University), 8-2 Trubetskaya st., Moscow 119991, Russia.
| | - Lesley Bell-Sakyi
- The Pirbright Institute, Pirbright, Woking, Surrey GU24 0NF, UK; Department of Infection Biology, Institute of Infection and Global Health, University of Liverpool, Liverpool L3 5RF, UK.
| | - Lidiya Iu Romanova
- Chumakov Institute of Poliomyelitis and Viral Encephalitides (Chumakov FSC R&D IBP RAS), prem. 8, k.17, pos. Institut Poliomyelita, poselenie Moskovskiy, Moscow, 108819, Russia; I.M. Sechenov First Moscow State Medical University of the Ministry of Health of the Russian Federation (Sechenov University), 8-2 Trubetskaya st., Moscow 119991, Russia.
| | - Galina G Karganova
- Chumakov Institute of Poliomyelitis and Viral Encephalitides (Chumakov FSC R&D IBP RAS), prem. 8, k.17, pos. Institut Poliomyelita, poselenie Moskovskiy, Moscow, 108819, Russia; Lomonosov MSU, Faculty of Biology, Lenin Hills, 1/12, Moscow, 119234, Russia; I.M. Sechenov First Moscow State Medical University of the Ministry of Health of the Russian Federation (Sechenov University), 8-2 Trubetskaya st., Moscow 119991, Russia.
| |
Collapse
|
37
|
Talactac MR, Yoshii K, Hernandez EP, Kusakisako K, Galay RL, Fujisaki K, Mochizuki M, Tanaka T. Synchronous Langat Virus Infection of Haemaphysalis longicornis Using Anal Pore Microinjection. Viruses 2017; 9:v9070189. [PMID: 28714929 PMCID: PMC5537681 DOI: 10.3390/v9070189] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 07/06/2017] [Accepted: 07/06/2017] [Indexed: 11/16/2022] Open
Abstract
The tick-borne encephalitis virus (TBEV) serocomplex of flaviviruses consists of arboviruses that cause important diseases in animals and humans. The transmission of this group of viruses is commonly associated with tick species such as Ixodes spp., Dermacentor spp., and Hyalomma spp. In the case of Haemaphysalis longicornis, the detection and isolation of flaviviruses have been previously reported. However, studies showing survival dynamics of any tick-borne flavivirus in H. longicornis are still lacking. In this study, an anal pore microinjection method was used to infect adult H. longicornis with Langat virus (LGTV), a naturally attenuated member of the TBEV serocomplex. LGTV detection in ticks was done by real-time PCR, virus isolation, and indirect immunofluorescent antibody test. The maximum viral titer was recorded at 28 days post-inoculation, and midgut cells were shown to be the primary replication site. The tick can also harbor the virus for at least 120 days and can successfully transmit LGTV to susceptible mice as confirmed by detection of LGTV antibodies. However, no transovarial transmission was observed from the egg and larval samples. Taken together, our results highly suggest that anal pore microinjection can be an effective method in infecting adult H. longicornis, which can greatly assist in our efforts to study tick and virus interactions.
Collapse
Affiliation(s)
- Melbourne Rio Talactac
- Laboratory of Infectious Diseases, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan.
- Department of Pathological and Preventive Veterinary Science, The United Graduate School of Veterinary Science, Yamaguchi University, Yoshida, Yamaguchi 753-8515, Japan.
- Department of Clinical and Population Health, College of Veterinary Medicine and Biomedical Sciences, Cavite State University, Cavite 4122, Philippines.
| | - Kentaro Yoshii
- Laboratory of Public Health, Faculty of Veterinary Medicine, Hokkaido University, Kita-ku Kita-18 Nishi-9, Sapporo, Hokkaido 060-0818, Japan.
| | - Emmanuel Pacia Hernandez
- Laboratory of Infectious Diseases, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan.
- Department of Pathological and Preventive Veterinary Science, The United Graduate School of Veterinary Science, Yamaguchi University, Yoshida, Yamaguchi 753-8515, Japan.
| | - Kodai Kusakisako
- Laboratory of Infectious Diseases, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan.
- Department of Pathological and Preventive Veterinary Science, The United Graduate School of Veterinary Science, Yamaguchi University, Yoshida, Yamaguchi 753-8515, Japan.
| | - Remil Linggatong Galay
- Department of Veterinary Paraclinical Sciences, College of Veterinary Medicine, University of the Philippines Los Baños, Los Baños, Laguna 4031, Philippines.
| | - Kozo Fujisaki
- National Agriculture and Food Research Organization, 3-1-5 Kannondai, Tsukuba, Ibaraki 305-0856, Japan.
| | - Masami Mochizuki
- Laboratory of Infectious Diseases, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan.
- Department of Pathological and Preventive Veterinary Science, The United Graduate School of Veterinary Science, Yamaguchi University, Yoshida, Yamaguchi 753-8515, Japan.
| | - Tetsuya Tanaka
- Laboratory of Infectious Diseases, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan.
- Department of Pathological and Preventive Veterinary Science, The United Graduate School of Veterinary Science, Yamaguchi University, Yoshida, Yamaguchi 753-8515, Japan.
| |
Collapse
|
38
|
Vrbová M, Belvončíková P, Kovaľová A, Matúšková R, Slovák M, Kúdelová M. Molecular detection of murine gammaherpesvirus 68 (MHV-68) in Haemaphysalis concinna ticks collected in Slovakia. Acta Virol 2017; 60:426-428. [PMID: 27928925 DOI: 10.4149/av_2016_04_426] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Murine gammaherpesvirus 68 (MHV-68) is a natural pathogen of murid rodents, which serve as hosts to Haemaphysalis concinna ticks. The occurrence of MHV-68 was investigated in a total of 47 H. concinna adult ticks collected on the vegetation in Gabčíkovo, situated in south-western Slovakia (47º54´0´´N, 17º35´0´´E), from May 2013 to May 2014. DNA from ticks was purified and screened by nested PCR targeting ORF50 of MHV-68 and the copy number of virus genome in ticks was determined by a real-time PCR assay specific for ORF65. The MHV-68 incidence in questing ticks was 38.3% (18/47) and the virus genome copy number per tick varied from 2x102 to 9.6x103. In this study, MHV-68 was documented for the first time in H. concinna ticks. Results expand previous data describing the occurrence of MHV-68 in Ixodes ricinus and Dermacentor reticulatus ticks collected in Slovakia, supporting the hypothesis that MHV-68 might be a newfound pathogen in ticks.
Collapse
|
39
|
McPherson M, García-García A, Cuesta-Valero FJ, Beltrami H, Hansen-Ketchum P, MacDougall D, Ogden NH. Expansion of the Lyme Disease Vector Ixodes Scapularis in Canada Inferred from CMIP5 Climate Projections. Environ Health Perspect 2017; 125:057008. [PMID: 28599266 PMCID: PMC5730520 DOI: 10.1289/ehp57] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Revised: 08/26/2016] [Accepted: 08/30/2016] [Indexed: 05/03/2023]
Abstract
BACKGROUND A number of studies have assessed possible climate change impacts on the Lyme disease vector, Ixodes scapularis. However, most have used surface air temperature from only one climate model simulation and/or one emission scenario, representing only one possible climate future. OBJECTIVES We quantified effects of different Representative Concentration Pathway (RCP) and climate model outputs on the projected future changes in the basic reproduction number (R0) of I. scapularis to explore uncertainties in future R0 estimates. METHODS We used surface air temperature generated by a complete set of General Circulation Models from the Coupled Model Intercomparison Project Phase 5 (CMIP5) to hindcast historical (1971-2000), and to forecast future effects of climate change on the R0 of I. scapularis for the periods 2011-2040 and 2041-2070. RESULTS Increases in the multimodel mean values estimated for both future periods, relative to 1971-2000, were statistically significant under all RCP scenarios for all of Nova Scotia, areas of New Brunswick and Quebec, Ontario south of 47°N, and Manitoba south of 52°N. When comparing RCP scenarios, only the estimated R0 mean values between RCP6.0 and RCP8.5 showed statistically significant differences for any future time period. CONCLUSION Our results highlight the potential for climate change to have an effect on future Lyme disease risk in Canada even if the Paris Agreement's goal to keep global warming below 2°C is achieved, although mitigation reducing emissions from RCP8.5 levels to those of RCP6.0 or less would be expected to slow tick invasion after the 2030s. https://doi.org/10.1289/EHP57.
Collapse
Affiliation(s)
- Michelle McPherson
- Climate & Atmospheric Sciences Institute and Dept. of Earth Sciences, St. Francis Xavier University, Antigonish, Nova Scotia, Canada
| | - Almudena García-García
- Climate & Atmospheric Sciences Institute and Dept. of Earth Sciences, St. Francis Xavier University, Antigonish, Nova Scotia, Canada
| | - Francisco José Cuesta-Valero
- Climate & Atmospheric Sciences Institute and Dept. of Earth Sciences, St. Francis Xavier University, Antigonish, Nova Scotia, Canada
| | - Hugo Beltrami
- Climate & Atmospheric Sciences Institute and Dept. of Earth Sciences, St. Francis Xavier University, Antigonish, Nova Scotia, Canada
- Centre pour l’étude et la simulation du climat à l’échelle régionale (ESCER), Université du Québec à Montréal
| | - Patti Hansen-Ketchum
- School of Nursing, St. Francis Xavier University, Antigonish, Nova Scotia, Canada
| | - Donna MacDougall
- School of Nursing, St. Francis Xavier University, Antigonish, Nova Scotia, Canada
- Canadian Center for Vaccinology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Nicholas Hume Ogden
- National Microbiology Laboratory, Public Health Agency of Canada, Saint-Hyacinthe, Québec, Canada
| |
Collapse
|
40
|
Palomar AM, Portillo A, Santibáñez S, García-Álvarez L, Muñoz-Sanz A, Márquez FJ, Romero L, Eiros JM, Oteo JA. Molecular (ticks) and serological (humans) study of Crimean-Congo hemorrhagic fever virus in the Iberian Peninsula, 2013-2015. Enferm Infecc Microbiol Clin 2017; 35:344-347. [PMID: 28291670 DOI: 10.1016/j.eimc.2017.01.009] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Revised: 01/24/2017] [Accepted: 01/30/2017] [Indexed: 11/17/2022]
Abstract
INTRODUCTION Crimean-Congo hemorrhagic fever (CCHF) is a viral disease, mainly transmitted through tick bite, of great importance in Public Health. In Spain, Crimean-Congo hemorrhagic fever virus (CCHFV) was detected for the first time in 2010 in Hyalomma lusitanicum ticks collected from deer in Cáceres. The aim of this study was to investigate the presence of CCHFV in ticks from Cáceres, and from other Spanish areas, and to evaluate the presence of antibodies against the virus in individuals exposed to tick bites. METHODS A total of 2053 ticks (1333 Hyalomma marginatum, 680 H. lusitanicum and 40 Rhipicephalus bursa) were analyzed using molecular biology techniques (PCR) for CCHFV detection. The determination of specific IgG antibodies against CCHFV in 228 serum samples from humans with regular contact with ticks (at risk of acquiring the infection) was performed by indirect immunofluorescence assay. RESULTS The CCHFV was not amplified in ticks, nor were antibodies against the virus found in the serum samples analyzed. CONCLUSION The absence of the CCHFV in the ticks studied and the lack of antibodies against the virus in individuals exposed to tick bites would seem to suggest a low risk of acquisition of human infection by CCHFV in Spain.
Collapse
Affiliation(s)
- Ana M Palomar
- Centro de Rickettsiosis y Enfermedades Transmitidas por Artrópodos Vectores, Departamento de Enfermedades Infecciosas, Hospital San Pedro-CIBIR, Logroño, Spain
| | - Aránzazu Portillo
- Centro de Rickettsiosis y Enfermedades Transmitidas por Artrópodos Vectores, Departamento de Enfermedades Infecciosas, Hospital San Pedro-CIBIR, Logroño, Spain
| | - Sonia Santibáñez
- Centro de Rickettsiosis y Enfermedades Transmitidas por Artrópodos Vectores, Departamento de Enfermedades Infecciosas, Hospital San Pedro-CIBIR, Logroño, Spain
| | - Lara García-Álvarez
- Centro de Rickettsiosis y Enfermedades Transmitidas por Artrópodos Vectores, Departamento de Enfermedades Infecciosas, Hospital San Pedro-CIBIR, Logroño, Spain
| | - Agustín Muñoz-Sanz
- Servicio de Patología Infecciosa, Hospital Universitario de Badajoz, Badajoz, Spain
| | - Francisco J Márquez
- Departamento de Biología Animal, Biología Vegetal y Ecología, Universidad de Jaén, Facultad de Ciencias Experimentales, Jaén, Spain
| | - Lourdes Romero
- Centro de Rickettsiosis y Enfermedades Transmitidas por Artrópodos Vectores, Departamento de Enfermedades Infecciosas, Hospital San Pedro-CIBIR, Logroño, Spain
| | - José M Eiros
- Facultad de Medicina, Universidad de Valladolid, Microbiología, Valladolid, Spain
| | - José A Oteo
- Centro de Rickettsiosis y Enfermedades Transmitidas por Artrópodos Vectores, Departamento de Enfermedades Infecciosas, Hospital San Pedro-CIBIR, Logroño, Spain.
| |
Collapse
|
41
|
Abstract
During 2006–2014, four tick-borne encephalitis (TBE) cases occurred among Israeli travelers. We calculated TBE incidence at 321.0, 45.0, 13.2, and 7.5 cases/100,000 travelers/year of travel to Sweden, Switzerland, Austria, and Germany, respectively. TBE incidence among travelers to these destinations appears to justify TBE vaccination in accordance with World Health Organization recommendations.
Collapse
|
42
|
Huntington MK, Allison J, Nair D. Emerging Vector-Borne Diseases. Am Fam Physician 2016; 94:551-557. [PMID: 27929218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Several mosquito-borne viral infections have recently emerged in North America; West Nile virus is the most common in the United States. Although West Nile virus generally causes a self-limited, flulike febrile illness, a serious neuroinvasive form may occur. Dengue is the most common vector-borne viral disease worldwide, and it has been a significant public health threat in the United States since 2009. Known as breakbone fever for its severe myalgias and arthralgias, dengue may cause a hemorrhagic syndrome. Chikungunya also causes flulike febrile illness and disabling arthralgias. Although meningoencephalitis may occur with chikungunya, bleeding is uncommon. Symptoms of Zika virus infection are similar to those of dengue, but milder. Zika virus increases the risk of fetal brain abnormalities, including microcephaly, if a pregnant woman is infected. Zika virus is spread through Aedes albopictus mosquito bites, is transmitted sexually, and may rarely spread nonsexually from person to person. Diagnosis of these vectorborne infections is clinical and serologic, and treatment is supportive. Other, well-established vector-borne diseases are also important. Ehrlichiosis is a tick-borne bacterial disease that presents as a nonspecific syndrome of fever, headache, malaise, and myalgias. It is diagnosed via blood smear testing, with confirmatory serology. Ehrlichiosis is treated with doxycycline. Rickettsial infections are transmitted by fleas, mites, and ticks, and severity ranges from mild to life threatening. Rocky Mountain spotted fever, the most significant rickettsial infection, is primarily a clinical diagnosis that presents as fever, headache, myalgias, petechial rash, and tick exposure. Doxycycline is effective for rickettsial infections if administered promptly. Vector avoidance strategies are critical to the prevention of all of these infections.
Collapse
Affiliation(s)
- Mark K Huntington
- University of South Dakota Sanford School of Medicine, Sioux Falls, SD, USA
| | - Jay Allison
- University of South Dakota Sanford School of Medicine, Sioux Falls, SD, USA
| | - Dilip Nair
- Joan C. Edwards School of Medicine at Marshall University, Huntington, WV, USA
| |
Collapse
|
43
|
Magadla NR, Vosloo W, Heath L, Gummow B. The African swine fever control zone in South Africa and its current relevance. Onderstepoort J Vet Res 2016; 83:a1034. [PMID: 27247068 PMCID: PMC6238692 DOI: 10.4102/ojvr.v83i1.1034] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Revised: 11/30/2015] [Accepted: 12/03/2015] [Indexed: 11/30/2022] Open
Abstract
African swine fever (ASF) has been reported in South Africa since the early 20th century. The disease has been controlled and confined to northern South Africa over the past 80 years by means of a well-defined boundary line, with strict control measures and movement restrictions north of this line. In 2012, the first outbreak of ASF outside the ASF control zone since 1996 occurred. The objective of this study was to evaluate the current relevance of the ASF control line as a demarcation line between endemic ASF (north) areas and ASF-free (south) area and to determine whether there was a need to realign its trajectory, given the recent outbreaks of ASF, global climate changes and urban development since the line's inception. A study of ASF determinants was conducted in an area 20 km north and 20 km south of the ASF control line, in Limpopo, Mpumalanga, North West and Gauteng provinces between May 2008 and September 2012. The study confirmed that warthogs, warthog burrows and the soft tick reservoir, Ornithodoros moubata, are present south of the ASF control line, but no virus or viral DNA was detected in these ticks. There appears to be an increasing trend in the diurnal maximum temperature and a decrease in humidity along the line, but the impact of these changes is uncertain. No discernible changes in minimum temperatures and average rainfall along the disease control line were observed between 1992 and 2014. Even though the reservoirs were found south of the ASF boundary line, the study concluded that there was no need to realign the trajectory of the ASF disease control line, with the exception of Limpopo Province. However, the provincial surveillance programmes for the reservoir, vector and ASF virus south of this line needs to be maintained and intensified as changing farming practices may favour the spread of ASF virus beyond the control line.
Collapse
Affiliation(s)
| | | | | | - Bruce Gummow
- Department of Production Animal Studies, University of Pretoria, South Africa; Discipline of Veterinary Science, James Cook University, Australia.
| |
Collapse
|
44
|
Luo LM, Zhao L, Wen HL, Zhang ZT, Liu JW, Fang LZ, Xue ZF, Ma DQ, Zhang XS, Ding SJ, Lei XY, Yu XJ. Haemaphysalis longicornis Ticks as Reservoir and Vector of Severe Fever with Thrombocytopenia Syndrome Virus in China. Emerg Infect Dis 2016; 21:1770-6. [PMID: 26402039 PMCID: PMC4593435 DOI: 10.3201/eid2110.150126] [Citation(s) in RCA: 209] [Impact Index Per Article: 26.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Transstadial and transovarial virus transmission occur among ticks, and transmission to mice can occur through a tick bite. Severe fever with thrombocytopenia syndrome (SFTS) is an emerging hemorrhagic fever in East Asia caused by SFTS virus (SFTSV), a newly discovered phlebovirus. The Haemaphysalis longicornis tick has been suspected to be the vector of SFTSV. To determine whether SFTSV can be transmitted among ticks, from ticks to animals, and from animals to ticks, we conducted transmission studies between developmental stages of H. longicornis ticks and between ticks and mice. Using reverse transcription PCR, we also analyzed the prevalence of SFTSV infection among H. longicornis ticks collected from vegetation in Shandong Province, China. Our results showed a low prevalence of SFTSV among collected ticks (0.2%, 8/3,300 ticks), and we showed that ticks fed on SFTSV-infected mice could acquire the virus and transstadially and transovarially transmit it to other developmental stages of ticks. Furthermore, SFTSV-infected ticks could transmit the virus to mice during feeding. Our findings indicate ticks could serve as a vector and reservoir of SFTSV.
Collapse
|
45
|
Savage HM, Godsey MS, Panella NA, Burkhalter KL, Ashley DC, Lash RR, Ramsay B, Patterson T, Nicholson WL. Surveillance for Heartland Virus (Bunyaviridae: Phlebovirus) in Missouri During 2013: First Detection of Virus in Adults of Amblyomma americanum (Acari: Ixodidae). J Med Entomol 2016; 53:607-612. [PMID: 27032416 DOI: 10.1093/jme/tjw028] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Accepted: 02/25/2016] [Indexed: 05/23/2023]
Abstract
During 2013, we collected and tested ticks for Heartland virus (HRTV), a recently described human pathogen in the genus Phlebovirus (Bunyaviridae), from six sites in northwestern Missouri. Five sites were properties owned by HRTV patients, and the sixth was a conservation area that yielded virus in ticks during 2012. We collected 39,096 ticks representing five species; however, two species, Amblyomma americanum (L.) (97.6%) and Dermacentor variabilis (Say) (2.3%), accounted for nearly all ticks collected. We detected 60 HRTV-positive tick pools and all were composed of A americanum: 53 pools of nymphs, six pools of male adults, and one pool of female adults. This is the first record of HRTV in adult ticks. Virus was detected at five properties that yielded A. americanum ticks, including properties owned by four of five patients. Virus was detected at two sites that yielded virus in 2012. Detection of virus in multiple years indicates that the virus persists in ticks within a relatively small geographic area, although infection rates (IR) may vary greatly among sites and between years at a site. IR per 1,000 A. americanum in northwestern Missouri during the April-July 2013 study period were as follows: all adults, IR = 1.13; adult females, IR = 0.33; adult males, IR = 1.90; and nymphs, IR = 1.79. The IR in nymphs, the stage with the largest data set, corresponds to 1/559 infected ticks. Having robust estimates of IR in various stages for A. americanum should lead to more accurate public health messaging and a better understanding of virus transmission.
Collapse
Affiliation(s)
- Harry M Savage
- Centers for Disease Control and Prevention, 3156 Rampart Rd., Fort Collins, CO 80521 (; ; ; ),
| | - Marvin S Godsey
- Centers for Disease Control and Prevention, 3156 Rampart Rd., Fort Collins, CO 80521 (; ; ; )
| | - Nicholas A Panella
- Centers for Disease Control and Prevention, 3156 Rampart Rd., Fort Collins, CO 80521 (; ; ; )
| | - Kristen L Burkhalter
- Centers for Disease Control and Prevention, 3156 Rampart Rd., Fort Collins, CO 80521 (; ; ; )
| | - David C Ashley
- Department of Biology, Missouri Western State University, St. Joseph, MO 64507 (; )
| | - R Ryan Lash
- Centers for Disease Control and Prevention, 1600 Clifton Rd., N.E., Atlanta, GA 30333 (; ), and
| | - Brian Ramsay
- Department of Biology, Missouri Western State University, St. Joseph, MO 64507 (; )
| | | | - William L Nicholson
- Centers for Disease Control and Prevention, 1600 Clifton Rd., N.E., Atlanta, GA 30333 (; ), and
| |
Collapse
|
46
|
Li Z, Bao C, Hu J, Liu W, Wang X, Zhang L, Ji Z, Feng Z, Li L, Shen A, Liu X, Zhao H, Tan W, Zhou J, Qi X, Zhu Y, Tang F, Cardona CJ, Xing Z. Ecology of the Tick-Borne Phlebovirus Causing Severe Fever with Thrombocytopenia Syndrome in an Endemic Area of China. PLoS Negl Trop Dis 2016; 10:e0004574. [PMID: 27035712 PMCID: PMC4818090 DOI: 10.1371/journal.pntd.0004574] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2015] [Accepted: 03/03/2016] [Indexed: 12/03/2022] Open
Abstract
Background Severe fever with thrombocytopenia syndrome (SFTS) is caused by SFTS virus (SFTSV), a tick-borne phlebovirus in family Bunyaviridae. Studies have found that humans, domestic and wildlife animals can be infected by SFTSV. However, the viral ecology, circulation, and transmission remain largely unknown. Methodology/Principal Findings Sixty seven human SFTS cases were reported and confirmed by virus isolation or immunofluorescence assay between 2011 and 2014. In 2013–2014 we collected 9,984 ticks from either vegetation or small wild mammals in the endemic area in Jiangsu, China, and detected SFTSV-RNA by real-time RT-PCR in both questing and feeding Haemaphysalis longicornis and H. flava. Viral RNA was identified in larvae of H. longicornis prior to a first blood meal, which has never been confirmed previously in nature. SFTSV-RNA and antibodies were also detected by RT-PCR and ELISA, respectively, in wild mammals including Erinaceus europaeus and Sorex araneus. A live SFTSV was isolated from Erinaceus europaeus captured during the off tick-feeding season and with a high SFTSV antibody titer. Furthermore, SFTSV antibodies were detected in the migratory birds Anser cygnoides and Streptopelia chinensis using ELISA. Conclusions/Significance The detection of SFTSV-RNA in non-engorged larvae indicated that vertical transmission of SFTSV in H. longicornis might occur in nature, which suggests that H. longicornis is a putative reservoir host of SFTSV. Small wild mammals such as Erinaceus europaeus and Sorex araneus could be infected by SFTSV and may serve as natural amplifying hosts. Our data unveiled that wild birds could be infected with SFTSV or carry SFTSV-infected ticks and thus might contribute to the long-distance spread of SFTSV via migratory flyways. These findings provide novel insights for understanding SFTSV ecology, reservoir hosts, and transmission in nature and will help develop new measures in preventing its rapid spread both regionally and globally. Severe fever with thrombocytopenia syndrome (SFTS) is an emerging hemorrhagic fever, caused by a tick-borne phlebovirus. Studies have found that a variety of domestic and wildlife animals can be infected by SFTS virus (SFTSV), but the natural reservoir host for the virus remains unclear. Although the SFTSV-RNA was identified in certain species of ticks or their larvae, contamination from their host animals cannot be excluded to be the source. We analyzed 9,984 ticks collected from vegetation or feeding mammals in 2013–2014 in Jiangsu province, an endemic area in China, and detected SFTSV-RNA in both parasitic and questing ticks. Interestingly, SFTSV-RNA was identified in larvae of Haemaphysalis longicornis, collected in vegetation without being blood fed, indicating a possibility of a vertical transmission of SFTSV in H. longicornisis in nature. We also detected SFTSV-RNA in four mammal species which may serve as natural amplifying hosts for SFTSV. In addition, we identified antibodies against the virus in two migratory bird species, suggesting wild birds, exposed to infected ticks, could spread the virus through flyways for long-distance transmission. These findings provide novel insights for understanding SFTSV ecology and transmission mechanism and help develop new measures to halt its rapid spread.
Collapse
Affiliation(s)
- Zhifeng Li
- Nanjing University Medical School, Nanjing, China
- Jiangsu Provincial Center for Disease Prevention and Control, Nanjing, China
| | - Changjun Bao
- Jiangsu Provincial Center for Disease Prevention and Control, Nanjing, China
| | - Jianli Hu
- Jiangsu Provincial Center for Disease Prevention and Control, Nanjing, China
| | - Wendong Liu
- Jiangsu Provincial Center for Disease Prevention and Control, Nanjing, China
| | - Xiaochen Wang
- Jiangsu Provincial Center for Disease Prevention and Control, Nanjing, China
| | - Lei Zhang
- Zhejiang Provincial Center for Disease Prevention and Control, Hangzhou, China
| | - Zhengmin Ji
- Jiangning Center for Disease Prevention and Control, Jiangning, China
| | - Zhi Feng
- Jiangning Center for Disease Prevention and Control, Jiangning, China
| | - Luxun Li
- Lishui Center for Disease Prevention and Control, Lishui, China
| | - Aihua Shen
- Lishui Center for Disease Prevention and Control, Lishui, China
| | - Xuejian Liu
- Xuyi Center for Disease Prevention and Control, Xuyi, China
| | - Hongjun Zhao
- Xuyi Center for Disease Prevention and Control, Xuyi, China
| | - Wenwen Tan
- Yixing Center for Disease Prevention and Control, Yixing, China
| | - Jiangang Zhou
- Yixing Center for Disease Prevention and Control, Yixing, China
| | - Xian Qi
- Jiangsu Provincial Center for Disease Prevention and Control, Nanjing, China
| | - Yefei Zhu
- Jiangsu Provincial Center for Disease Prevention and Control, Nanjing, China
| | - Fenyang Tang
- Jiangsu Provincial Center for Disease Prevention and Control, Nanjing, China
| | - Carol J. Cardona
- College of Veterinary Medicine, University of Minnesota at Twin Cities, Saint Paul, Minnesota, United States of America
| | - Zheng Xing
- Nanjing University Medical School, Nanjing, China
- College of Veterinary Medicine, University of Minnesota at Twin Cities, Saint Paul, Minnesota, United States of America
- * E-mail:
| |
Collapse
|
47
|
Yun SM, Lee WG, Ryou J, Yang SC, Park SW, Roh JY, Lee YJ, Park C, Han MG. Severe fever with thrombocytopenia syndrome virus in ticks collected from humans, South Korea, 2013. Emerg Infect Dis 2016; 20:1358-61. [PMID: 25061851 PMCID: PMC4111194 DOI: 10.3201/eid2008.131857] [Citation(s) in RCA: 153] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
We investigated the infection rate for severe fever with thrombocytopenia syndrome virus (SFTSV) among ticks collected from humans during May-October 2013 in South Korea. Haemaphysalis longicornis ticks have been considered the SFTSV vector. However, we detected the virus in H. longicornis, Amblyomma testudinarium, and Ixodes nipponensis ticks, indicating additional potential SFTSV vectors.
Collapse
|
48
|
Liu R, Zhang G, Liu X, Li Y, Zheng Z, Sun X, Yang Y. [Detection of the Siberian Tick-borne Encephalitis Virus in the Xinjiang Uygur Autonomous Region, northwestern China]. Bing Du Xue Bao 2016; 32:26-31. [PMID: 27295880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Until the recent emergence/re-emergence of human-pathogenic viruses in ticks, tick-borne viruses have been neglected as causative agents of human disease (particularly in China). To gain insight into the diversity of tick-borne viruses in Xinjiang Uygur Autonomous Region (northwestern China), we conducted illumina deep sequencing-based screening for virus-derived small RNAs in field-collected Ixodes persulcatus ticks. We found 32, 631 unique virus-matched reads. In particular, 77 reads mapped to the tick-borne group within the genus of Flavivirus, and covered 3.8%-2.4% viral genomes. In addition, 32 unique reads were specific to the Siberian subtype of tick-borne encephalitis viruses (TBEV-Sib) which have never been reported in Chinese TBE loci. We confirmed the potential existence of TBEV-Sib by amplification (using reverse transcription-polymerase chain reaction) of genomic fragments from the envelope gene or 3' genomic terminus from the pools of examined ticks. Both sequences demonstrated high homology to TBEV-Sib strains attached geographically to southern Siberia with nucleotide identity of 97.2%-95.5% and aminoacid identity of 99.4%-98.3%, respectively. In conclusion, we report, for the first time, detection of TBEV-Sib in the natural TBE loci of China. These novel data may provide genetic information for further isolation and epidemiologic investigation of TBEV-Sib.
Collapse
|
49
|
Xing X, Guan X, Liu L, Zhan J, Jiang H, Liu L, Li G, Xiong J, Tan L, Xu J, Jiang Y, Yao X, Zhan F, Nie S. Natural Transmission Model for Severe Fever With Thrombocytopenia Syndrome Bunyavirus in Villages of Hubei Province, China. Medicine (Baltimore) 2016; 95:e2533. [PMID: 26825892 PMCID: PMC5291562 DOI: 10.1097/md.0000000000002533] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Severe fever with thrombocytopenia syndrome (SFTS), an emerging high-fatality infectious disease, is caused by a novel bunyavirus. However, a clear natural transmission model has not yet been established. We conducted a cross-sectional study with in-depth investigation of villages to systematically understand the transmission and risk factors among humans, host animals, and vectors. Village residents were interviewed using standardized questionnaires, in which there were confirmed cases of new infections, between August 2012 and May 2013. Serum samples from all villagers and animals, as well as tick specimens, were collected for qRT-PCR and antibody testing. The seropositivity rate among villagers was 8.4% (35/419), which was lower than that among domesticated animals (54.0%, 27/50; χ(2)= 81.1, P < 0.05). SFTS viral RNA was most commonly detected among domesticated animals (14.0%), followed by ticks (3.1%) and humans (1.7%; χ(2) = 23.1, P < 0.05). The homology of the S gene fragment was 98%. Tick bites were significantly associated with SFTSV infection (Conditional Logistic Regression odds ratio [OR] = 2.5, 95% confidence interval [CI], 1.0-6.6). We provided systematic evidence on a natural transmission model for SFTSV from reservoir hosts (domesticated animals) to vectors (Haemaphysalis longicornis) to humans, and close contact with SFTS confirmed patients was not found to be a risk factor for natural transmission.
Collapse
Affiliation(s)
- Xuesen Xing
- From Department of Epidemiology and Health Statistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China (XX, HJ, LL, SN); Hubei Provincial Center for Disease Control and Prevention, Wuhan, China (XX, FZ, XG, LL, JZ, GL, JX, LT, JX, YZ, XY)
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
50
|
Kovalev SY, Mukhacheva TA. [UNIFICATION OF THE MOLECULAR EPIDEMIOLOGICAL RESEARCH OF THE TICK-BORNE ENCEPHALITIS]. Vopr Virusol 2016; 61:89-95. [PMID: 27451502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Molecular genetic techniques and approaches in epidemiological studies were breakthrough in the understanding of the laws, ways, and mechanisms of the spread of the pathogens. However, lack of standard methods makes it difficult to compare results obtained by different scientific groups. In this work we propose to choose one fragment of the TBEV genome as a genetic marker whose sequencing would be both obligatory and sufficient for the molecular epidemiological studies. The best candidate for this purpose may be a fragment of the gene E of 454 nucleotides in length. The deduced amino acid sequence of this fragment was a basis for a new approach for the TBEV differentiation with clusteron being a structural unit (Kovalev and Mukhacheva, 2013). The clusteron approach was proved to be informative for studying the genetic structure of the TBEV-Sib population in the Middle Urals. TBE foci were shown to be unique in both quantitative and qualitative composition of the clusterons. The greatest clusteron diversity in the south of the Middle Urals, through the Trans-Siberian way, may reflect the history of the colonization, closely associated with the roads between Siberia and the European part of Russia. The age of three clusterons did not exceed 50 years, which may indicate an ongoing evolutionary process taking place in the TBEV-Sib populations. In turn, their spatial distribution indicates the crucial role of human factors in the spread of the TBEV (Kovalev & Mukhacheva, 2014). The clusteron approach provides formalization of ideas about the structure of the viral populations and could be used not only by researchers but also by epidemiological surveillance services. Unification of the studies of the TBEV on the basis of a standard genetic marker would consolidate the efforts of researchers from different regions of Russia and other countries.
Collapse
|