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GENDREL D, RAYMOND J. [Pertussis worldwide. Vaccinating children and adults]. Med Trop Sante Int 2023; 3:mtsi.v3i4.2023.446. [PMID: 38390013 PMCID: PMC10879894 DOI: 10.48327/mtsi.v3i4.2023.446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 10/23/2023] [Indexed: 02/24/2024]
Abstract
Pertussis (whooping cough) is an important cause of morbidity and mortality in infants world-wide, and continues to be a public health concern despite high vaccination coverage. The disease, caused by bacterium Bordetella pertussis, is present in all countries. Before vaccines became widely available in the 1950s, pertussis was one of the most common childhood diseases worldwide. According to WHO, estimation of deaths was 4 millions/year in 1950 and 100 000/year in 2015. But morbidity remains important with a high circulation of the bacterium determining atypical clinical forms after whole cell or acellular vaccines use. This is due mainly to the absence of booster doses in adolescents and adults. Major progress are generalisation of PCR and vaccination of mother during pregnancy. A resurgence of pertussis is observed after generalisation of acellular vaccines use. In China the progression of allele ptxPl was found in all areas following the use of acellular vaccine. This allele, rare before acellullar vaccine, is linked to a macrolide resistance, and reaches more than 30% of strains isolated in hospitalised children.These evolutions must be evaluated in clinical forms and genotyping of all strains, in all areas.
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Affiliation(s)
- Dominique GENDREL
- Université Paris Cité, 12 de l’École-de-Médecine, 5006 Paris, France
| | - Josette RAYMOND
- Université Paris Cité, 12 de l’École-de-Médecine, 5006 Paris, France
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2
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Creutz I, Busche T, Layer F, Bednarz H, Kalinowski J, Niehaus K. Evaluation of virulence potential of methicillin-sensitive and methicillin-resistant Staphylococcus aureus isolates from a German refugee cohort. Travel Med Infect Dis 2021; 45:102204. [PMID: 34785377 DOI: 10.1016/j.tmaid.2021.102204] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 03/23/2021] [Revised: 11/04/2021] [Accepted: 11/09/2021] [Indexed: 11/15/2022]
Abstract
BACKGROUND Community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA) seem to be highly transmissible, often infect otherwise healthy humans and frequently occur in hospital outbreaks. METHODS Refugees, living in accommodations in Germany were screened for nasal carriage of S. aureus. The isolates were investigated regarding resistance and virulence, phenotypically and by whole genome data analysis. RESULTS 5.6% (9/161) of the refugees are carriers of S. aureus. 2.5% (4/161) are MRSA carriers. Among the refugees, spa-types t021, t084, t304, t991 and t4983 were detected, as well as the new spa-types t18794 and t18795. t304 and t991 are assumed to be local spa-types from the middle east. The isolates are less resistant and marginal biofilm formers. Each isolate has a remarkable set of virulence genes, although genes, encoding for proteins strongly associated with invasive S. aureus infections, like Panton-Valentine leucocidin, were not detected. CONCLUSION The detection of strains from the middle east, supports the assumption that strains co-travel with the refugees and persist despite a transition of the host's living conditions. Whole genome data analysis does not permit to finally evaluate a germ's virulence. Nevertheless, an impression of the virulence potential of the strains, regarding skills in colonization, resistance, immune evasion, and host cell damaging can be pictured.
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Affiliation(s)
- Ines Creutz
- Proteome and Metabolome Research, Faculty of Biology, Bielefeld University, Bielefeld, Germany; FlüGe Graduate School, School of Public Heath, Bielefeld University, Bielefeld, Germany.
| | - Tobias Busche
- Technology Platform Genomics, CeBiTec, Bielefeld University, Bielefeld, Germany.
| | - Franziska Layer
- Department of Infectious Diseases, Division Nosocomial Pathogens and Antibiotic Resistances, National Reference Centre for Staphylococci and Enterococci, Robert Koch Institute, Wernigerode, Germany.
| | - Hanna Bednarz
- Proteome and Metabolome Research, Faculty of Biology, Bielefeld University, Bielefeld, Germany.
| | - Jörn Kalinowski
- Technology Platform Genomics, CeBiTec, Bielefeld University, Bielefeld, Germany.
| | - Karsten Niehaus
- Proteome and Metabolome Research, Faculty of Biology, Bielefeld University, Bielefeld, Germany.
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3
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Rouamba T, Samadoulougou S, Ouédraogo M, Hien H, Tinto H, Kirakoya-Samadoulougou F. Asymptomatic malaria and anaemia among pregnant women during high and low malaria transmission seasons in Burkina Faso: household-based cross-sectional surveys in Burkina Faso, 2013 and 2017. Malar J 2021; 20:211. [PMID: 33933072 PMCID: PMC8088076 DOI: 10.1186/s12936-021-03703-4] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Accepted: 03/15/2021] [Indexed: 11/29/2022] Open
Abstract
Background Malaria in endemic countries is often asymptomatic during pregnancy, but it has substantial consequences for both the mother and her unborn baby. During pregnancy, anaemia is an important consequence of malaria infection. In Burkina Faso, the intensity of malaria varies according to the season, albeit the prevalence of malaria and anaemia as well as their risk factors, during high and low malaria transmission seasons is underexplored at the household level. Methods Data of 1751 pregnant women from October 2013 to March 2014 and 1931 pregnant women from April 2017 to June 2017 were drawn from two cross-sectional household surveys conducted in 24 health districts of Burkina Faso. Pregnant women were tested for malaria in their household after consenting. Asymptomatic carriage was defined as a positive result from malaria rapid diagnostic tests in the absence of clinical symptoms of malaria. Anaemia was defined as haemoglobin level less than 11 g/dL in the first and third trimester and less than 10.5 g/dL in the second trimester of pregnancy. Results Prevalence of asymptomatic malaria in pregnancy was estimated at 23.9% (95% CI 20.2–28.0) during the high transmission season (October–November) in 2013. During the low transmission season, it was 12.7% (95% CI 10.9–14.7) between December and March in 2013–2014 and halved (6.4%; 95% CI 5.3–7.6) between April and June 2017. Anaemia prevalence was estimated at 59.4% (95% CI 54.8–63.8) during the high transmission season in 2013. During the low transmission season, it was 50.6% (95% CI 47.7–53.4) between December and March 2013–2014 and 65.0% (95% CI 62.8–67.2) between April and June, 2017. Conclusion This study revealed that the prevalence of malaria asymptomatic carriage and anaemia among pregnant women at the community level remain high throughout the year. Thus, more efforts are needed to increase prevention measures such as IPTp–SP coverage in order to reduce anaemia and contribute to preventing low birth weight and poor pregnancy outcomes.
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Affiliation(s)
- Toussaint Rouamba
- Clinical Research Unit of Nanoro, Institut de Recherche en Sciences de La Santé, Centre National de La Recherche Scientifique Et Technologique, 42, Avenue Kumda-Yoore, BP 218 Ouagadougou CMS 11, Ouagadougou, Burkina Faso. .,Centre de Recherche en Epidémiologie, Biostatistique Et Recherche Clinique, Ecole de Santé Publique, Université Libre de Bruxelles (ULB), Route de Lennik, 808, 1070, Bruxelles, Belgium.
| | - Sékou Samadoulougou
- Evaluation Platform On Obesity Prevention, Quebec Heart and Lung Institute, Quebec, G1V 4G5, Canada.,Centre for Research On Planning and Development (CRAD), Laval University, Quebec, G1V 0A6, Canada
| | - Mady Ouédraogo
- Centre de Recherche en Epidémiologie, Biostatistique Et Recherche Clinique, Ecole de Santé Publique, Université Libre de Bruxelles (ULB), Route de Lennik, 808, 1070, Bruxelles, Belgium.,Institut National de La Statistique Et de La Démographie [INSD], 01 BP 374, Ouagadougou 01, Ouagadougou, Burkina Faso
| | - Hervé Hien
- Intitut National de Santé Publique (INSP), Centre Muraz, Bobo-Dioulasso, Burkina Faso.,Institut de Recherche en Sciences de La Santé, Centre National de La Recherche Scientifique Et Technologique, 42, Avenue Kumda-Yoore, BP 218 Ouagadougou CMS 11, Ouagadougou, Burkina Faso
| | - Halidou Tinto
- Clinical Research Unit of Nanoro, Institut de Recherche en Sciences de La Santé, Centre National de La Recherche Scientifique Et Technologique, 42, Avenue Kumda-Yoore, BP 218 Ouagadougou CMS 11, Ouagadougou, Burkina Faso
| | - Fati Kirakoya-Samadoulougou
- Centre de Recherche en Epidémiologie, Biostatistique Et Recherche Clinique, Ecole de Santé Publique, Université Libre de Bruxelles (ULB), Route de Lennik, 808, 1070, Bruxelles, Belgium
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Raman J, Gast L, Balawanth R, Tessema S, Brooke B, Maharaj R, Munhenga G, Tshikae P, Lakan V, Mwamba T, Makowa H, Sangweni L, Mkhabela M, Zondo N, Mohulatsi E, Nyawo Z, Ngxongo S, Msimang S, Dagata N, Greenhouse B, Birkholtz LM, Shirreff G, Graffy R, Qwabe B, Moonasar D. High levels of imported asymptomatic malaria but limited local transmission in KwaZulu-Natal, a South African malaria-endemic province nearing malaria elimination. Malar J 2020; 19:152. [PMID: 32295590 PMCID: PMC7161075 DOI: 10.1186/s12936-020-03227-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 04/06/2020] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND KwaZulu-Natal, one of South Africa's three malaria endemic provinces, is nearing malaria elimination, reporting fewer than 100 locally-acquired cases annually since 2010. Despite sustained implementation of essential interventions, including annual indoor residual spraying, prompt case detection using malaria rapid diagnostics tests and treatment with effective artemisinin-based combination therapy, low-level focal transmission persists in the province. This malaria prevalence and entomological survey was therefore undertaken to identify the drivers of this residual transmission. METHODS Malaria prevalence as well as malaria knowledge, attitudes and practices among community members and mobile migrant populations within uMkhanyakude district, KwaZulu-Natal were assessed during a community-based malaria prevalence survey. All consenting participants were tested for malaria by both conventional and highly-sensitive falciparum-specific rapid diagnostic tests. Finger-prick filter-paper blood spots were also collected from all participants for downstream parasite genotyping analysis. Entomological investigations were conducted around the surveyed households, with potential breeding sites geolocated and larvae collected for species identification and insecticide susceptibility testing. A random selection of households were assessed for indoor residual spray quality by cone bioassay. RESULTS A low malaria prevalence was confirmed in the study area, with only 2% (67/2979) of the participants found to be malaria positive by both conventional and highly-sensitive falciparum-specific rapid diagnostic tests. Malaria prevalence however differed markedly between the border market and community (p < 0001), with the majority of the detected malaria carriers (65/67) identified as asymptomatic Mozambican nationals transiting through the informal border market from Mozambique to economic hubs within South Africa. Genomic analysis of the malaria isolates revealed a high degree of heterozygosity and limited genetic relatedness between the isolates supporting the hypothesis of limited local malaria transmission within the province. New potential vector breeding sites, potential vector populations with reduced insecticide susceptibility and areas with sub-optimal vector intervention coverage were identified during the entomological investigations. CONCLUSION If KwaZulu-Natal is to successfully halt local malaria transmission and prevent the re-introduction of malaria, greater efforts need to be placed on detecting and treating malaria carriers at both formal and informal border crossings with transmission blocking anti-malarials, while ensuring optimal coverage of vector control interventions is achieved.
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Affiliation(s)
- Jaishree Raman
- Centre for Emerging Zoonotic and Parasitic Diseases, National Institute for Communicable Diseases, a Division of the National Health Laboratory Service, Johannesburg, Gauteng, South Africa. .,Wits Research Institute for Malaria, Faculty of Health Sciences, University of Witwatersrand, Johannesburg, Gauteng, South Africa. .,UP Institute for Sustainable Malaria Control, Faculty of Health Sciences, University of Pretoria, Pretoria, Gauteng, South Africa.
| | - Laura Gast
- Clinton Health Access Initiative, Pretoria, Gauteng, South Africa
| | - Ryleen Balawanth
- Clinton Health Access Initiative, Pretoria, Gauteng, South Africa
| | - Sofonias Tessema
- Department of Medicine, University of California-San Francisco, San Francisco, USA
| | - Basil Brooke
- Centre for Emerging Zoonotic and Parasitic Diseases, National Institute for Communicable Diseases, a Division of the National Health Laboratory Service, Johannesburg, Gauteng, South Africa.,Wits Research Institute for Malaria, Faculty of Health Sciences, University of Witwatersrand, Johannesburg, Gauteng, South Africa
| | - Rajendra Maharaj
- UP Institute for Sustainable Malaria Control, Faculty of Health Sciences, University of Pretoria, Pretoria, Gauteng, South Africa.,Office of Malaria Research, South African Medical Research Council, Durban, KwaZulu-Natal, South Africa
| | - Givemore Munhenga
- Centre for Emerging Zoonotic and Parasitic Diseases, National Institute for Communicable Diseases, a Division of the National Health Laboratory Service, Johannesburg, Gauteng, South Africa.,Wits Research Institute for Malaria, Faculty of Health Sciences, University of Witwatersrand, Johannesburg, Gauteng, South Africa
| | - Power Tshikae
- Centre for Emerging Zoonotic and Parasitic Diseases, National Institute for Communicable Diseases, a Division of the National Health Laboratory Service, Johannesburg, Gauteng, South Africa
| | - Vishan Lakan
- Office of Malaria Research, South African Medical Research Council, Durban, KwaZulu-Natal, South Africa
| | - Tshiama Mwamba
- Centre for Emerging Zoonotic and Parasitic Diseases, National Institute for Communicable Diseases, a Division of the National Health Laboratory Service, Johannesburg, Gauteng, South Africa.,Wits Research Institute for Malaria, Faculty of Health Sciences, University of Witwatersrand, Johannesburg, Gauteng, South Africa
| | - Hazel Makowa
- Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, Gauteng, South Africa
| | - Lindi Sangweni
- KwaZulu-Natal Provincial Malaria Control Programme, Jozini, KwaZulu-Natal, South Africa
| | - Moses Mkhabela
- KwaZulu-Natal Provincial Malaria Control Programme, Jozini, KwaZulu-Natal, South Africa
| | - Nompumelelo Zondo
- KwaZulu-Natal Provincial Malaria Control Programme, Jozini, KwaZulu-Natal, South Africa
| | | | - Zuziwe Nyawo
- KwaZulu-Natal Provincial Malaria Control Programme, Jozini, KwaZulu-Natal, South Africa
| | - Sifiso Ngxongo
- KwaZulu-Natal Provincial Malaria Control Programme, Jozini, KwaZulu-Natal, South Africa
| | - Sipho Msimang
- KwaZulu-Natal Provincial Department of Health, Pietermaritzburg, KwaZulu-Natal, South Africa
| | - Nicole Dagata
- Clinton Health Access Initiative, Pretoria, Gauteng, South Africa
| | - Bryan Greenhouse
- Department of Medicine, University of California-San Francisco, San Francisco, USA
| | - Lyn-Marie Birkholtz
- Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, Gauteng, South Africa
| | - George Shirreff
- Clinton Health Access Initiative, Pretoria, Gauteng, South Africa
| | - Rebecca Graffy
- Clinton Health Access Initiative, Pretoria, Gauteng, South Africa
| | - Bheki Qwabe
- KwaZulu-Natal Provincial Malaria Control Programme, Jozini, KwaZulu-Natal, South Africa
| | - Devanand Moonasar
- UP Institute for Sustainable Malaria Control, Faculty of Health Sciences, University of Pretoria, Pretoria, Gauteng, South Africa.,Malaria Vector Borne and Zoonotic Diseases, National Department of Health, Pretoria, Gauteng, South Africa
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5
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Varela ML, Koffi D, White M, Niang M, Mbengue B, Diene Sarr F, Touré AO, Perraut R. Practical example of multiple antibody screening for evaluation of malaria control strategies. Malar J 2020; 19:117. [PMID: 32192514 PMCID: PMC7082935 DOI: 10.1186/s12936-020-03186-9] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Accepted: 03/09/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Ongoing efforts to fight Plasmodium falciparum malaria has reduced malaria in many areas, but new tools are needed to monitor further progress, including indicators of decreasing exposure to parasite infection. Sero-surveillance is considered promising to monitor exposure, transmission and immunity. METHODS IgG responses to three antigen biomarkers were evaluated in a retrospective study involving: (i) surveys of 798 asymptomatic villagers from 2 Senegalese endemic settings conducted before 2002 and after the 2013 intensification of control measures, and (ii) in 105 symptomatic individuals from different settings in Côte d'Ivoire. Response to up to eight P. falciparum antigens, including recombinant MSP1p9 antigen and LSA141 peptide, were analysed using multiplex technology and responses to whole P. falciparum schizont extract (SE, local strain adapted to culture) were measured by ELISA. RESULTS MSP1p9 and LSA141 IgG responses were shown to be relevant indicators monitoring immune status in the different study sites both from Côte d'Ivoire and Senegal. Between 2002 and 2013, individuals participating in both studies showed higher decline of sero-positivity in young (< 15 years: range 12% to 50%) than older (> 15 years: no decline to 15%) individuals from Dielmo and Ndiop. A mathematical sero-catalytic model from the complete Dielmo/Ndiop survey was used to reconstruct declining levels of sero-positivity in more detail, demonstrating that anti-SE seroprevalence levels most accurately reflected malaria exposure in the two villages. CONCLUSION For standard screening of population immune status at sites envisaging elimination, the use of ELISA-based assays targeting selected antigens can contribute to provide important epidemiologic surveillance data to aid malaria control programmes.
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Affiliation(s)
| | - David Koffi
- Unité de Paludologie, Institut Pasteur de Côte d'Ivoire, Abidjan, Côte d'Ivoire
| | - Michael White
- Malaria Unit, Parasites and hosts, Institut Pasteur, Paris, France
| | - Makhtar Niang
- Unité d'Immunologie, Institut Pasteur de Dakar, Dakar, Senegal
| | - Babacar Mbengue
- Unité d'Immunogénétique, Institut Pasteur de Dakar, Dakar, Senegal.,Service d'Immunologie FMPO, Université Cheikh Anta Diop de Dakar, Dakar, Senegal
| | | | | | - Ronald Perraut
- Unité d'Immunologie, Institut Pasteur de Dakar, Dakar, Senegal. .,Unité d'Immunogénétique, Institut Pasteur de Dakar, Dakar, Senegal. .,Centre Pasteur du Cameroun, Annexe de Garoua, Garoua, Cameroun.
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6
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Cohen R, Cohen S, Afraimov M, Finn T, Babushkin F, Geller K, Paikin S, Yoffe I, Valinsky L, Ron M, Rokney A. Screening asymptomatic households for Streptococcus pyogenes pharyngeal carriage as a part of in-hospital investigation of puerperal sepsis. Am J Infect Control 2019; 47:1493-1499. [PMID: 31296346 DOI: 10.1016/j.ajic.2019.05.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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: 02/19/2019] [Revised: 05/29/2019] [Accepted: 05/29/2019] [Indexed: 11/17/2022]
Abstract
BACKGROUND Invasive group A streptococcal (iGAS) infection in the peripartum setting is a rare but devastating disease occasionally occurring as a health care-associated infection (HAI). Current guidelines suggest enhanced surveillance and streptococcal isolate storage after a single case of iGAS, as well as a full epidemiological investigation that includes screening health care workers (HCWs) from several sites after 2 cases. Current guidelines do not recommend routine screening of household members of a patient with iGAS. METHODS We conducted studies of 3 patients with iGAS puerperal sepsis and related epidemiologic and molecular investigations. RESULTS Identical GAS emm gene types were found in pharyngeal cultures of 3 asymptomatic spouses of patients with iGAS puerperal sepsis. HCWs screened negative for GAS, and emm typing indicated that other iGAS cases from this hospital were sporadic and not related to the puerperal cases. CONCLUSIONS The concurrent presence of the same emm type in a household member practically excludes the option of an inadvertent HAI or facility outbreak. Hence, we suggest that screening close family members for asymptomatic GAS carriage should be performed early as a part of infection prevention measures, as doing so would have significant utility in saving time and resources related to a full epidemiological inquiry.
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Affiliation(s)
- Regev Cohen
- Infectious Diseases Unit, Sanz Medical Center, Laniado Hospital, Netanya, Israel; Ruth and Bruce Rappaport Faculty of Medicine, Technion Medicine, Haifa, Israel.
| | - Shoshana Cohen
- Infectious Diseases Unit, Sanz Medical Center, Laniado Hospital, Netanya, Israel
| | - Marina Afraimov
- Infectious Diseases Unit, Sanz Medical Center, Laniado Hospital, Netanya, Israel
| | - Talya Finn
- Infectious Diseases Unit, Sanz Medical Center, Laniado Hospital, Netanya, Israel; Ruth and Bruce Rappaport Faculty of Medicine, Technion Medicine, Haifa, Israel
| | - Frida Babushkin
- Infectious Diseases Unit, Sanz Medical Center, Laniado Hospital, Netanya, Israel
| | - Keren Geller
- Infectious Diseases Unit, Sanz Medical Center, Laniado Hospital, Netanya, Israel
| | - Svetlana Paikin
- Microbiology Laboratory, Sanz Medical Center, Laniado Hospital, Netanya, Israel
| | - Irena Yoffe
- Hematology Ward, Sanz Medical Center, Laniado Hospital, Netanya, Israel
| | - Lea Valinsky
- Central Laboratories, Ministry of Health, Jerusalem, Israel
| | - Merav Ron
- Central Laboratories, Ministry of Health, Jerusalem, Israel
| | - Assaf Rokney
- Central Laboratories, Ministry of Health, Jerusalem, Israel
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7
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Stone NE, Nunnally AE, Jimenez V, Cope EK, Sahl JW, Sheridan K, Hornstra HM, Vinocur J, Settles EW, Headley KC, Williamson CHD, Rideout JR, Bolyen E, Caporaso JG, Terriquez J, Monroy FP, Busch JD, Keim P, Wagner DM. Domestic canines do not display evidence of gut microbial dysbiosis in the presence of Clostridioides (Clostridium) difficile, despite cellular susceptibility to its toxins. Anaerobe 2019; 58:53-72. [PMID: 30946985 DOI: 10.1016/j.anaerobe.2019.03.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [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: 09/27/2018] [Revised: 03/11/2019] [Accepted: 03/25/2019] [Indexed: 12/14/2022]
Abstract
Clostridioides difficile infection (CDI) is an emerging public health threat and C. difficile is the most common cause of antimicrobial-associated diarrhea worldwide and the leading cause of hospital-associated infections in the US, yet the burden of community-acquired infections (CAI) is poorly understood. Characterizing C. difficile isolated from canines is important for understanding the role that canines may play in CAI. In addition, several studies have suggested that canines carry toxigenic C. difficile asymptomatically, which may imply that there are mechanisms responsible for resistance to CDI in canines that could be exploited to help combat human CDI. To assess the virulence potential of canine-derived C. difficile, we tested whether toxins TcdA and TcdB (hereafter toxins) derived from a canine isolate were capable of causing tight junction disruptions to colonic epithelial cells. Additionally, we addressed whether major differences exist between human and canine cells regarding C. difficile pathogenicity by exposing them to identical toxins. We then examined the canine gut microbiome associated with C. difficile carriage using 16S rRNA gene sequencing and searched for deviations from homeostasis as an indicator of CDI. Finally, we queried 16S rRNA gene sequences for bacterial taxa that may be associated with resistance to CDI in canines. Clostridioides difficile isolated from a canine produced toxins that reduced tight junction integrity in both human and canine cells in vitro. However, canine guts were not dysbiotic in the presence of C. difficile. These findings support asymptomatic carriage in canines and, furthermore, suggest that there are features of the gut microbiome and/or a canine-specific immune response that may protect canines against CDI. We identified two biologically relevant bacteria that may aid in CDI resistance in canines: 1) Clostridium hiranonis, which synthesizes secondary bile acids that have been shown to provide resistance to CDI in mice; and 2) Sphingobacterium faecium, which produces sphingophospholipids that may be associated with regulating homeostasis in the canine gut. Our findings suggest that canines may be cryptic reservoirs for C. difficile and, furthermore, that mechanisms of CDI resistance in the canine gut could provide insights into targeted therapeutics for human CDI.
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Affiliation(s)
- Nathan E Stone
- Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, 86011, USA.
| | - Amalee E Nunnally
- Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, 86011, USA.
| | - Victor Jimenez
- Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ, 86011, USA.
| | - Emily K Cope
- Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, 86011, USA.
| | - Jason W Sahl
- Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, 86011, USA; Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ, 86011, USA.
| | - Krystal Sheridan
- Translational Genomics Research Institute, Flagstaff, AZ, 86001, USA.
| | - Heidie M Hornstra
- Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, 86011, USA.
| | - Jacob Vinocur
- Northern Arizona Healthcare, Flagstaff Medical Center, Flagstaff, AZ, 86001, USA.
| | - Erik W Settles
- Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, 86011, USA; Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ, 86011, USA.
| | - Kyle C Headley
- Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, 86011, USA.
| | - Charles H D Williamson
- Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, 86011, USA.
| | - Jai Ram Rideout
- Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, 86011, USA.
| | - Evan Bolyen
- Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, 86011, USA.
| | - J Gregory Caporaso
- Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, 86011, USA.
| | - Joel Terriquez
- Northern Arizona Healthcare, Flagstaff Medical Center, Flagstaff, AZ, 86001, USA.
| | - Fernando P Monroy
- Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ, 86011, USA.
| | - Joseph D Busch
- Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, 86011, USA.
| | - Paul Keim
- Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, 86011, USA; Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ, 86011, USA; Translational Genomics Research Institute, Flagstaff, AZ, 86001, USA
| | - David M Wagner
- Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, 86011, USA; Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ, 86011, USA.
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8
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Niang M, Sane R, Sow A, Sadio BD, Chy S, Legrand E, Faye O, Diallo M, Sall AA, Menard D, Toure-Balde A. Asymptomatic Plasmodium vivax infections among Duffy-negative population in Kedougou, Senegal. Trop Med Health 2018; 46:45. [PMID: 30618490 PMCID: PMC6311047 DOI: 10.1186/s41182-018-0128-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Accepted: 12/11/2018] [Indexed: 02/08/2023] Open
Abstract
Background In the southeastern Senegal, the report of Plasmodium vivax infections among febrile patients in Kedougou constitutes a new emerging health problem. Methods Samples from 48 asymptomatic schoolchildren sampled twice a year over 2 years were used to explore the reservoir of P. vivax parasite infections in this region. Both Duffy genotyping and Plasmodium species diagnostic assays were performed. Results PCR assays detected Plasmodium genomic DNA in 38.5% (74/192) of samples. Pure P. falciparum and P. vivax infections were identified in 79.7% (59/74) and 20.3% (15/74) of samples, respectively. All schoolchildren were classified as Duffy-negative by genotyping. P. vivax infections were detected in five children: in two children during both years, in one child in 2010 and on May 2011, and only in 2010 for the remaining two children. Conclusions This unexpectedly high proportion of P. vivax infections in asymptomatic Duffy-negative children highlights to consider vivax malaria as an emerging problem in Senegal.
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Affiliation(s)
- Makhtar Niang
- 1Immunology Unit, Pasteur Institute of Dakar, BP 220 Dakar, Senegal
| | - Rokhaya Sane
- 1Immunology Unit, Pasteur Institute of Dakar, BP 220 Dakar, Senegal.,2Department of Animal Biology, Cheikh Anta Diop University of Dakar, Dakar, Senegal
| | - Abdourahmane Sow
- 3Arbovirus and Viral Hemorrhagic Fevers Unit, Pasteur Institute of Dakar, BP 220 Dakar, Senegal.,West African Health Organization, Ouagadougou, Burkina Faso
| | - Bacary D Sadio
- 3Arbovirus and Viral Hemorrhagic Fevers Unit, Pasteur Institute of Dakar, BP 220 Dakar, Senegal
| | - Sophy Chy
- Malaria Molecular Epidemiology Unit, Institute Pasteur in Cambodia, Phnom Penh, Cambodia
| | - Eric Legrand
- 6Groupe Génétique du Paludisme et Résistance, Unité Biologie des Interactions Hôte-Parasite, Institut Pasteur, Paris, France
| | - Ousmane Faye
- 3Arbovirus and Viral Hemorrhagic Fevers Unit, Pasteur Institute of Dakar, BP 220 Dakar, Senegal
| | - Mawlouth Diallo
- 7Medical Entomology Unit, Pasteur Institute of Dakar, BP 220 Dakar, Senegal
| | - Amadou A Sall
- 3Arbovirus and Viral Hemorrhagic Fevers Unit, Pasteur Institute of Dakar, BP 220 Dakar, Senegal
| | - Didier Menard
- 6Groupe Génétique du Paludisme et Résistance, Unité Biologie des Interactions Hôte-Parasite, Institut Pasteur, Paris, France
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9
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Ny S, Kozlov R, Dumpis U, Edquist P, Gröndahl-Yli-Hannuksela K, Kling AM, Lis DO, Lübbert C, Pomorska-Wesołowska M, Palagin I, Vilde A, Vuopio J, Walter J, Wisell KT. Large variation in ESBL-producing Escherichia coli carriers in six European countries including Russia. Eur J Clin Microbiol Infect Dis 2018; 37:2347-2354. [PMID: 30338465 DOI: 10.1007/s10096-018-3382-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [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: 07/19/2018] [Accepted: 09/13/2018] [Indexed: 01/30/2023]
Abstract
We investigated the faecal carriage prevalence of extended-spectrum β-lactamase production in Escherichia coli (EP-EC) and/or Klebsiella pneumoniae (EP-KP) and risk factors associated with carriage among adult study subjects in Finland, Germany, Latvia, Poland, Russia and Sweden (partner countries). The aim was to get indicative data on the prevalence of ESBL-carriage in specific populations in the region. Faecal samples were collected from four study populations and screened on ChromID-ESBL and ChromID-OXA-48 plates. Positive isolates were further characterised phenotypically. Our results show a large variation in carrier prevalence ranging from 1.6% in Latvia to 23.2% in Russia for EP-EC. For the other partner countries, the prevalence of EP-EC were in increasing numbers, 2.3% for Germany, 4.7% for Finland, 6.6% for Sweden, 8.0% for Poland and 8.1% for all partner countries in total. Carriers of EP-KP were identified only in Finland, Russia and Sweden, and the prevalence was < 2% in each of these countries. No carriers of carbapenemase-producing isolates were identified. This is the first study reporting prevalence of carriers (excluding traveller studies) for Finland, Latvia, Poland and Russia. It contributes with important information regarding the prevalence of EP-EC and EP-KP carriage in regions where studies on carriers are limited.
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Affiliation(s)
- Sofia Ny
- Public Health Agency of Sweden, Nobels väg 18, 17182 Solna, Stockholm, Sweden.
- Division of Clinical Microbiology, Department of Laboratory Medicine, Karolinska Institutet, Alfred Nobels allé 10, 141 52 Huddinge, Stockholm, Sweden.
| | - Roman Kozlov
- Institute of Antimicrobial Chemotherapy of Smolensk State Medical University, PO Box N 5, Smolensk, 214019, Russia
| | - Uga Dumpis
- Pauls Stradins Clinical University Hospital, Pilsoņu iela 13, Zemgales priekšpilsēta, Rīga, LV-1002, Latvia
| | - Petra Edquist
- Public Health Agency of Sweden, Nobels väg 18, 17182 Solna, Stockholm, Sweden
| | | | - Anna-Maria Kling
- Public Health Agency of Sweden, Nobels väg 18, 17182 Solna, Stockholm, Sweden
| | - Danuta O Lis
- Institute of Occupational Medicine and Environmental Health, Kościelna 13, 40-001, Sosnowiec, Poland
| | - Christoph Lübbert
- Division of Infectious Diseases and Tropical Medicine, Leipzig University Hospital, Liebigstraße 20, 04103, Leipzig, Germany
| | | | - Ivan Palagin
- Institute of Antimicrobial Chemotherapy of Smolensk State Medical University, PO Box N 5, Smolensk, 214019, Russia
| | - Aija Vilde
- Pauls Stradins Clinical University Hospital, Pilsoņu iela 13, Zemgales priekšpilsēta, Rīga, LV-1002, Latvia
| | - Jaana Vuopio
- University of Turku, 20014 Turun yliopisto, Turku, Finland
| | - Jan Walter
- Robert Koch Institute, Seestraße 10, 13353, Berlin, Germany
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10
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Lawrance MF, Mansfield KL, Sutton E, Savage AE. Molecular evolution of fibropapilloma-associated herpesviruses infecting juvenile green and loggerhead sea turtles. Virology 2018; 521:190-7. [PMID: 29960922 DOI: 10.1016/j.virol.2018.06.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 06/21/2018] [Accepted: 06/22/2018] [Indexed: 11/23/2022]
Abstract
Chelonid Alphaherpesvirus 5 (ChHV5) has long been associated with fibropapillomatosis (FP) tumor disease in marine turtles. Presenting primarily in juvenile animals, FP results in fibromas of the skin, connective tissue, and internal organs, which may indirectly affect fitness by obstructing normal turtle processes. ChHV5 is near-universally present in tumorous tissues taken from affected animals, often at very high concentrations. However, there is also considerable asymptomatic carriage amongst healthy marine turtles, suggesting that asymptomatic hosts play an important role in disease ecology. Currently, there is a paucity of studies investigating variation in viral genetics between diseased and asymptomatic hosts, which could potentially explain why only some ChHV5 infections lead to tumor formation. Here, we generated a database containing DNA from over 400 tissue samples taken from green and loggerhead marine turtles, including multiple tissue types, a twenty year time span, and both diseased and asymptomatic animals. We used two molecular detection techniques, quantitative (q)PCR and nested PCR, to characterize the presence and genetic lineage of ChHV5 in each sample. We found that nested PCR across multiple loci out-performed qPCR and is a more powerful technique for determining infection status. Phylogenetic reconstruction of three viral loci from all ChHV5-positive samples indicated widespread panmixia of viral lineages, with samples taken across decades, species, disease states, and tissues all falling within the same evolutionary lineages. Haplotype networks produced similar results in that viral haplotypes were shared across species, tissue types and disease states with no evidence that viral lineages associated significantly with disease dynamics. Additionally, tests of selection on viral gene trees indicated signals of selection dividing major clades, though this selection did not divide sample categories. Based on these data, neither the presence of ChHV5 infection nor neutral genetic divergence between viral lineages infecting a juvenile marine turtle is sufficient to explain the development of FP within an individual.
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11
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Niang M, Diop F, Niang O, Sadio BD, Sow A, Faye O, Diallo M, Sall AA, Perraut R, Toure-Balde A. Unexpected high circulation of Plasmodium vivax in asymptomatic children from Kédougou, southeastern Senegal. Malar J 2017; 16:497. [PMID: 29284488 PMCID: PMC5747145 DOI: 10.1186/s12936-017-2146-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Accepted: 12/18/2017] [Indexed: 01/06/2023] Open
Abstract
Background Malaria in Senegal is due essentially to infections by Plasmodium falciparum and, to a lesser extent to Plasmodium malariae and Plasmodium ovale. By the use of molecular methods, detection of Plasmodium vivax has been recently reported in the region of Kedougou, raising the question of appraisal of its potential prevalence in this setting. Methods A retrospective serological study was carried out using 188 samples taken from 2010 to 2011 in a longitudinal school survey during which 48 asymptomatic children (9–11 years) were recruited. Four collections of samples collected during two successive dry and rainy seasons were analysed for antibody responses to P. vivax and P. falciparum. Recombinant P. falciparum and P. vivax MSP1 antigens and total P. falciparum schizont lysate from African 07/03 strain (adapted to culture) were used for ELISA. Nested PCR amplification was used for molecular detection of P. vivax. Results A surprising high prevalence of IgG responses against P. vivax MSP1 was evidenced with 53% of positive samples and 58% of the individuals that were found positive to this antigen. There was 77% of responders to P. falciparum outlined by 63% of positive samples. Prevalence of responders did not differ as function of seasons. Levels of antibodies to P. falciparum fluctuated with significant increasing between dry and rainy season (P < 0.05), contrary to responses to P. vivax. There was a significant reciprocal relationship (P < 10−3) between antibody responses to the different antigens, but with weak coefficient of correlation (Rho around 0.3) underlining a variable profile at the individual level. Clear molecular signature was found in positive IgG to P. vivax msp1 samples by PCR. Conclusion This cross-sectional longitudinal study highlights the unexpected high circulation of P. vivax in this endemic area. Sero-immunology and molecular methods are powerful additive tools to identify endemic sites where relevant control measures have to be settled and monitored.
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Affiliation(s)
- Makhtar Niang
- Immunology Unit, Institut Pasteur de Dakar, Dakar, Senegal
| | - Fode Diop
- Immunology Unit, Institut Pasteur de Dakar, Dakar, Senegal
| | - Oulimata Niang
- Immunology Unit, Institut Pasteur de Dakar, Dakar, Senegal
| | - Bacary D Sadio
- Arbovirus and Viral Hemorrhagic Fevers Unit, Institut Pasteur de Dakar, Dakar, Senegal
| | - Abdourahmane Sow
- Arbovirus and Viral Hemorrhagic Fevers Unit, Institut Pasteur de Dakar, Dakar, Senegal.,West African Health Organization, Ouagadougou, Burkina Faso
| | - Ousmane Faye
- Arbovirus and Viral Hemorrhagic Fevers Unit, Institut Pasteur de Dakar, Dakar, Senegal
| | - Mawlouth Diallo
- Medical Entomology Unit, Institut Pasteur de Dakar, Dakar, Senegal
| | - Amadou A Sall
- Arbovirus and Viral Hemorrhagic Fevers Unit, Institut Pasteur de Dakar, Dakar, Senegal
| | - Ronald Perraut
- Immunology Unit, Institut Pasteur de Dakar, Dakar, Senegal
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12
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Allegretti JR, Allegretti AS, Phelps E, Xu H, Kassam Z, Fischer M. Asymptomatic Clostridium difficile carriage rate post-fecal microbiota transplant is low: a prospective clinical and stool assessment. Clin Microbiol Infect 2017; 24:780.e1-780.e3. [PMID: 29104169 DOI: 10.1016/j.cmi.2017.10.022] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 10/13/2017] [Accepted: 10/28/2017] [Indexed: 01/17/2023]
Abstract
OBJECTIVES We aimed to assess the asymptomatic Clostridium difficile carriage rates following fecal microbiota transplantation (FMT). METHODS All patients who underwent FMT for recurrent Clostridium difficile infection (CDI) via colonoscopy or sigmoidoscopy between June 2013 and April 2015 and had a minimum of 8-week follow-up post FMT at two tertiary care referral centres were included in the study. Patients were prospectively followed both clinically and with stool assessments for 8 weeks post FMT. Assessments occurred at 1 week and 4 weeks post FMT to assess for failure. Failure was defined as presence of diarrhoeal symptoms and a positive CDI stool test by polymerase chain reaction for toxin gene (PCR) at any time point during the 8-week follow-up period. CDI stool testing using PCR was performed at weeks 1 and 4 post FMT in asymptomatic patients as well. RESULTS 167 patients were included. Twenty-eight patients (16.7% (28/167)) were FMT failures throughout the 8-week period. At week 1, seven patients had already failed the FMT. Of the remaining 160 patients, 144 were asymptomatic, and among these, 141 were negative for C. difficile toxin gene by PCR. This resulted in an asymptomatic carriage rate of 2.1% (3/144). At week 4, 143 patients had not yet failed FMT. Of these patients 129 patients were asymptomatic and among those, 125 were negative by PCR, resulting in an asymptomatic carriage rate of 3% (3/129). CONCLUSIONS Asymptomatic carriage after FMT is rare. This suggests that testing for cure after FMT in asymptomatic patients is not necessary.
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Affiliation(s)
- J R Allegretti
- Division of Gastroenterology, Brigham and Women's Hospital, Boston, MA, Harvard Medical School, USA.
| | - A S Allegretti
- Division of Nephrology, Massachusetts General Hospital, Boston, MA, USA
| | - E Phelps
- Division of Gastroenterology and Hepatology, Indiana University, Indianapolis, IN, USA
| | - H Xu
- Department of Biostatistics, The Richard M. Fairbanks School of Public Health and School of Medicine, Indiana University, Indianapolis, IN, USA
| | - Z Kassam
- OpenBiome, Somerville, MA, USA; Massachusetts Institute of Technology, Cambridge, MA, USA
| | - M Fischer
- Division of Gastroenterology and Hepatology, Indiana University, Indianapolis, IN, USA
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13
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Landier J, Kajeechiwa L, Thwin MM, Parker DM, Chaumeau V, Wiladphaingern J, Imwong M, Miotto O, Patumrat K, Duanguppama J, Cerqueira D, Malleret B, Rénia L, Nosten S, von Seidlein L, Ling C, Proux S, Corbel V, Simpson JA, Dondorp AM, White NJ, Nosten FH. Safety and effectiveness of mass drug administration to accelerate elimination of artemisinin-resistant falciparum malaria: A pilot trial in four villages of Eastern Myanmar. Wellcome Open Res 2017; 2:81. [PMID: 29062913 PMCID: PMC5635445 DOI: 10.12688/wellcomeopenres.12240.1] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/21/2017] [Indexed: 01/26/2023] Open
Abstract
Background: Artemisinin and partner drug-resistant falciparum malaria is expanding over the Greater Mekong Sub-region (GMS). Eliminating falciparum malaria in the GMS while drugs still retain enough efficacy could prevent global spread of antimalarial resistance. Eliminating malaria rapidly requires targeting the reservoir of asymptomatic parasite carriers. This pilot trial aimed to evaluate the acceptability, safety, feasibility and effectiveness of mass-drug administration (MDA) in reducing malaria in four villages in Eastern Myanmar. Methods: Villages with ≥30% malaria prevalence were selected. Long-lasting insecticidal bednets (LLINs) and access to malaria early diagnosis and treatment (EDT) were provided. Two villages received MDA immediately and two were followed for nine months pre-MDA. MDA consisted of a 3-day supervised course of dihydroartemisinin-piperaquine and single low-dose primaquine administered monthly for three months. Adverse events (AE) were monitored by interviews and consultations. Malaria prevalence was assessed by ultrasensitive PCR quarterly for 24 months. Symptomatic malaria incidence,entomological indices, and antimalarial resistance markers were monitored. Results: MDA was well tolerated. There were no serious AE and mild to moderate AE were reported in 5.6%(212/3931) interviews. In the smaller villages, participation to three MDA courses was 61% and 57%, compared to 28% and 29% in the larger villages. Baseline prevalence was higher in intervention than in control villages (18.7% (95%CI=16.1-21.6) versus 6.8%(5.2-8.7), p<0.0001) whereas three months after starting MDA, prevalence was lower in intervention villages (0.4%(0.04-1.3) versus 2.7%(1.7-4.1), p=0.0014). After nine months the difference was no longer significant (2.0%(1.0-3.5) versus 0.9%(0.04-1.8), p=0.10). M0-M9 symptomatic falciparum incidence was similar between intervention and control. Before/after MDA comparisons showed that asymptomatic
P. falciparum carriage and anopheline vector positivity decreased significantly whereas prevalence of the artemisinin-resistance molecular marker remained stable. Conclusions: This MDA was safe and feasible, and, could accelerate elimination of
P. falciparum in addition to EDT and LLINs
when community participation was sufficient.
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Affiliation(s)
- Jordi Landier
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand
| | - Ladda Kajeechiwa
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand
| | - May Myo Thwin
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand
| | - Daniel M Parker
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand
| | - Victor Chaumeau
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand.,Maladies Infectieuses et Vecteurs Ecologie, Génétique, Evolution et Contrôle (IRD 224-CNRS 4280 UM1-UM2), Institut de Recherche pour le Développement, Montpellier, France.,Centre Hospitalier Régional Universitaire de Montpellier, Montpellier, France
| | - Jacher Wiladphaingern
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand
| | - Mallika Imwong
- Mahidol Oxford Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.,Department of Molecular Tropical Medicine and Genetics, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Olivo Miotto
- Mahidol Oxford Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.,Centre for Genomics and Global Health, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, OX3 7BN, UK.,Wellcome Trust Sanger Institute, Cambridge, CB10 1SA, UK
| | - Krittaya Patumrat
- Department of Molecular Tropical Medicine and Genetics, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Jureeporn Duanguppama
- Department of Molecular Tropical Medicine and Genetics, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Dominique Cerqueira
- Mahidol Oxford Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Benoit Malleret
- Department of Microbiology & Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 119077, Singapore.,Singapore Immunology Network (SIgN), Agency for Science & Technology, Singapore, 138632, Singapore
| | - Laurent Rénia
- Singapore Immunology Network (SIgN), Agency for Science & Technology, Singapore, 138632, Singapore
| | - Suphak Nosten
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand
| | - Lorenz von Seidlein
- Mahidol Oxford Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Clare Ling
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand
| | - Stéphane Proux
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand
| | - Vincent Corbel
- Maladies Infectieuses et Vecteurs Ecologie, Génétique, Evolution et Contrôle (IRD 224-CNRS 4280 UM1-UM2), Institut de Recherche pour le Développement, Montpellier, France
| | - Julie A Simpson
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, VIC, 3053, Australia
| | - Arjen M Dondorp
- Mahidol Oxford Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, OX3 7BN, UK
| | - Nicholas J White
- Mahidol Oxford Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand.,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, OX3 7BN, UK
| | - François H Nosten
- Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Mae Sot, Thailand.,Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, OX3 7BN, UK
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Kulkarni T, Aikawa C, Nozawa T, Murase K, Maruyama F, Nakagawa I. DNA-based culture-independent analysis detects the presence of group a streptococcus in throat samples from healthy adults in Japan. BMC Microbiol 2016; 16:237. [PMID: 27724855 PMCID: PMC5057481 DOI: 10.1186/s12866-016-0858-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Accepted: 10/01/2016] [Indexed: 12/11/2022] Open
Abstract
Background Group A Streptococcus (GAS; Streptococcus pyogenes) causes a range of mild to severe infections in humans. It can also colonize healthy persons asymptomatically. Therefore, it is important to study GAS carriage in healthy populations, as carriage of it might lead to subsequent disease manifestation, clonal spread in the community, and/or diversification of the organism. Throat swab culture is the gold standard method for GAS detection. Advanced culture-independent methods provide rapid and efficient detection of microorganisms directly from clinical samples. We investigated the presence of GAS in throat swab samples from healthy adults in Japan using culture-dependent and culture-independent methods. Results Two throat swab samples were collected from 148 healthy volunteers. One was cultured on selective medium, while total DNA extracted from the other was polymerase chain reaction (PCR) amplified with two GAS-specific primer pairs: one was a newly designed 16S rRNA-specific primer pair, the other a previously described V-Na+-ATPase primer pair. Although only 5 (3.4 %) of the 148 samples were GAS-positive by the culture-dependent method, 146 (98.6 %) were positive for the presence of GAS DNA by the culture-independent method. To obtain serotype information by emm typing, we performed nested PCR using newly designed emm primers. We detected the four different emm types in 25 (16.9 %) samples, and these differed from the common emm types associated with GAS associated diseases in Japan. The different emm types detected in the healthy volunteers indicate that the presence of unique emm types might be associated with GAS carriage. Conclusions Our results suggest that culture-independent methods should be considered for profiling GAS in the healthy hosts, with a view to obtaining better understanding of these organisms. The GAS-specific primers (16S rRNA and V-Na+-ATPase) used in this study can be used to estimate the maximum potential GAS carriage in people. Electronic supplementary material The online version of this article (doi:10.1186/s12866-016-0858-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Tejaswini Kulkarni
- Department of Molecular Craniofacial Embryology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, 113-8510, Japan.,Department of Microbiology, Graduate School of Medicine, Kyoto University, Kyoto, 606-8501, Japan
| | - Chihiro Aikawa
- Department of Microbiology, Graduate School of Medicine, Kyoto University, Kyoto, 606-8501, Japan
| | - Takashi Nozawa
- Department of Microbiology, Graduate School of Medicine, Kyoto University, Kyoto, 606-8501, Japan
| | - Kazunori Murase
- Department of Microbiology, Graduate School of Medicine, Kyoto University, Kyoto, 606-8501, Japan
| | - Fumito Maruyama
- Department of Microbiology, Graduate School of Medicine, Kyoto University, Kyoto, 606-8501, Japan.
| | - Ichiro Nakagawa
- Department of Microbiology, Graduate School of Medicine, Kyoto University, Kyoto, 606-8501, Japan
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15
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Moritz ED, Hanson BM, Kates AE, Smith TC. Molecular characteristics of Staphylococcus aureus isolated from employees, children, and environmental surfaces in Iowa child daycare facilities. Am J Infect Control 2015; 43:482-8. [PMID: 25752957 DOI: 10.1016/j.ajic.2015.01.022] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Revised: 01/13/2015] [Accepted: 01/20/2015] [Indexed: 12/18/2022]
Abstract
BACKGROUND Infectious agents have the potential to thrive in child daycare facilities. Asymptomatic Staphylococcus aureus carriage is a risk factor for developing infection and contributes to transmission. METHODS We collected swabs from 110 employees, 111 unexposed adults, 81 children, and 214 environmental surfaces at 11 Iowa daycare facilities. S aureus isolates were characterized using antibiotic resistance profiles and Staphylococcal protein A typing. Staphylococcal protein A types were grouped into cluster complexes using the Based Upon Repeat Pattern algorithm. RESULTS All isolates (from 38 employees, 37 unexposed adults, 16 children, and 19 surfaces) were characterized. Daycare employees were more likely to carry erythromycin-resistant S aureus than unexposed adults (odds ratio, 3.7; 95% confidence interval, 1.1-12.7; P = .033). Isolates were genetically heterogeneous, although isolates from employees appeared more clonal than those from unexposed adults. Strains associated with ST8 were identified in 5 daycare facilities and 3 unexposed adults. CONCLUSIONS S aureus isolates collected from employees, children, and surfaces of daycare facilities are genetically heterogeneous, but contain strains associated with community-associated methicillin-resistant S aureus. This suggests that daycare facilities can serve as reservoirs for community-associated methicillin-resistant S aureus and facilitate genetic exchange. Employees may be at increased risk of carrying antibiotic-resistant strains, indicating more research is necessary into this occupational group.
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16
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Abstract
Mycoplasma pneumoniae is a common cause of respiratory tract infections (RTI's), especially in children. While severe M. pneumoniae infections are generally treated with antibiotics, the diagnosis as well as treatment of these infections should be reconsidered in the light of recent clinical findings. First, M. pneumoniae was found to be carried in the upper respiratory tract of a relatively high percentage of healthy, asymptomatic children. Clearly, this complicates the diagnosis of a suspected M. pneumoniae RTI and, thus, the decision when to initiate treatment. A complication in the treatment of these infections is that data on the efficacy of antibiotic treatment of M. pneumoniae RTI's are sparse and derived exclusively from comparative studies. A recent Cochrane review concluded that there is insufficient evidence about the efficacy of antibiotics for M. pneumoniae lower respiratory tract infections (LRTI) in children. Due to side effects associated with the use of tetracyclines and quinolones in children, only macrolides can be used to treat M. pneumoniae infections in young patients. The general applicability of macrolides, however, is currently threatened by the worldwide increase in macrolide-resistant M. pneumoniae strains. Finally, limited evidence is available that corticosteroids might have an additional benefit in the treatment of M. pneumoniae infections. In this review, the current issues related to the diagnosis and treatment of M. pneumoniae infections will be discussed.
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Affiliation(s)
- Emiel B M Spuesens
- Department of Pediatrics, Division of Infectious Diseases and Immunology, Erasmus University Medical Center-Sophia Children's Hospital, PO Box 2040, 3000 CA Rotterdam, The Netherlands.
| | - Patrick M Meyer Sauteur
- Department of Pediatrics, Division of Infectious Diseases and Immunology, Erasmus University Medical Center-Sophia Children's Hospital, PO Box 2040, 3000 CA Rotterdam, The Netherlands.
| | - Cornelis Vink
- Department of Pediatrics, Division of Infectious Diseases and Immunology, Erasmus University Medical Center-Sophia Children's Hospital, PO Box 2040, 3000 CA Rotterdam, The Netherlands; Erasmus University College, Erasmus University Rotterdam, P.O. Box 1738, 3000 DR Rotterdam, The Netherlands.
| | - Annemarie M C van Rossum
- Department of Pediatrics, Division of Infectious Diseases and Immunology, Erasmus University Medical Center-Sophia Children's Hospital, PO Box 2040, 3000 CA Rotterdam, The Netherlands.
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Bauer MP, Farid A, Bakker M, Hoek RAS, Kuijper EJ, van Dissel JT. Patients with cystic fibrosis have a high carriage rate of non-toxigenic Clostridium difficile. Clin Microbiol Infect 2013; 20:O446-9. [PMID: 24286342 DOI: 10.1111/1469-0691.12439] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Revised: 10/22/2013] [Accepted: 10/29/2013] [Indexed: 11/29/2022]
Abstract
Thirty-year-old observations report frequent asymptomatic Clostridium difficile carriage among cystic fibrosis (CF) patients. In this case-control study, we found more carriers among CF patients than controls (47% versus 11%), but most strains carried by CF patients were non-toxigenic (77% versus 17%). Among CF patients, carriers were younger, with more severe pulmonary disease than non-carriers. Strains belonged to multiple PCR-ribotypes, suggesting that these CF patients did not acquire strains from each other.
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Affiliation(s)
- M P Bauer
- Department of Infectious Diseases, Center for Infectious Diseases, Leiden University Medical Center, Leiden, the Netherlands
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