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TSUZUKI N, MARUKO T, TAKEYAMA A, IKEDA H, MIZUGUCHI Y. Evaluation of oxidative stress in foals with Rhodococcus equi infection-induced pneumonia for the judgment of therapeutic effect. J Vet Med Sci 2023; 85:1277-1280. [PMID: 37853622 PMCID: PMC10788166 DOI: 10.1292/jvms.23-0260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 10/04/2023] [Indexed: 10/20/2023] Open
Abstract
Forty-five foals with Rhodococcus equi infection and pneumonia symptoms were classified into a surviving group and a dead group. Using serum samples, the oxidative stress index (OSI) was determined at the first visit and the follow-up visit. The OSI of the surviving group was significantly lower at the follow-up than that at the first visit. No significant difference was observed between the OSI of the dead group at the first and follow-up visits. In the surviving group, treatment at the first visit mitigated inflammation and reduced OSI. However, in the dead group, poor response to the treatment provided at the first visit led to continued inflammation, and no change was observed the OSI.
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Affiliation(s)
| | - Tosei MARUKO
- Obihiro University of Agriculture and Veterinary Medicine,
Hokkaido, Japan
| | - Akiko TAKEYAMA
- Obihiro University of Agriculture and Veterinary Medicine,
Hokkaido, Japan
| | - Hiroki IKEDA
- Hidaka Horse Breeders Association, Hokkaido, Japan
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Takai S, Suzuki Y, Sasaki Y, Kakuda T, Ribeiro MG, Makrai L, Witkowski L, Cohen N, Sekizaki T. Short review: Geographical distribution of equine-associated pVAPA plasmids in Rhodococcus equi in the world. Vet Microbiol 2023; 287:109919. [PMID: 38000208 DOI: 10.1016/j.vetmic.2023.109919] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 10/25/2023] [Accepted: 11/19/2023] [Indexed: 11/26/2023]
Abstract
Virulent Rhodococcus equi strains expressing virulence-associated 15-17 kDa protein (VapA) and having a large virulence plasmid (pVAPA) of 85-90 kb containing vapA gene are pathogenic for horses. In the last two decades, following pVAPA, two host-associated virulence plasmid types of R. equi have been discovered: a circular plasmid, pVAPB, associated with porcine isolates in 1995, and a recently detected linear plasmid, pVAPN, related to bovine and caprine isolates. Molecular epidemiological studies of R. equi infection in foals on horse-breeding farms in Japan and many countries around the world have been conducted in the last three decades, and the epidemiological studies using restriction enzyme digestion patterns of plasmid DNAs from virulent isolates have shown 14 distinct pVAPA subtypes and their geographical preference. This short review summarizes previous reports regarding equine-associated pVAPA subtypes in the world and discusses their geographic distribution from the standpoint of horse movements.
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Affiliation(s)
- Shinji Takai
- Department of Animal Hygiene, School of Veterinary Medicine, Kitasato University, Towada, Aomori 034-8628, Japan.
| | - Yasunori Suzuki
- Department of Animal Hygiene, School of Veterinary Medicine, Kitasato University, Towada, Aomori 034-8628, Japan
| | - Yukako Sasaki
- Department of Animal Hygiene, School of Veterinary Medicine, Kitasato University, Towada, Aomori 034-8628, Japan
| | - Tsutomu Kakuda
- Department of Animal Hygiene, School of Veterinary Medicine, Kitasato University, Towada, Aomori 034-8628, Japan
| | - Márcio Garcia Ribeiro
- Department of Veterinary Hygiene and Public Health, School of Veterinary Medicine and Animal Sciences, UNESP-São Paulo State University, Botucatu, SP, Brazil
| | - László Makrai
- Department of Microbiology and Infectious Diseases, Faculty of Veterinary Science, Szent István University, Hungária krt. 23-25, H-1143 Budapest, Hungary
| | - Lucjan Witkowski
- Laboratory of Veterinary Epidemiology and Economics, Faculty of Veterinary Medicine, Warsaw University of Life Sciences, Nowoursynowska 159c, 02-776, Warsaw, Poland
| | - Noah Cohen
- Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX, USA
| | - Tsutomu Sekizaki
- Department of Microbiology, Graduate School of Medicine, Kyoto University, Kyoto, Japan; Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, Japan
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Knox A, Zerna G, Beddoe T. Current and Future Advances in the Detection and Surveillance of Biosecurity-Relevant Equine Bacterial Diseases Using Loop-Mediated Isothermal Amplification (LAMP). Animals (Basel) 2023; 13:2663. [PMID: 37627456 PMCID: PMC10451754 DOI: 10.3390/ani13162663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 08/13/2023] [Accepted: 08/15/2023] [Indexed: 08/27/2023] Open
Abstract
Horses play an important role throughout the world, whether for work, culture, or leisure, providing an ever-growing significant contribution to the economy. The increase in importation and movement of horses, both nationally and internationally, has inevitably allowed for the global equine industry to grow. Subsequently, however, the potential for transmission of fatal equine bacterial diseases has also escalated, and devasting outbreaks continue to occur. To prevent such events, disease surveillance and diagnosis must be heightened throughout the industry. Current common, or "gold-standard" techniques, have shown to be inadequate at times, thus requiring newer technology to impede outbreaks. Loop-mediated isothermal amplification (LAMP) has proven to be a reliable, rapid, and accessible tool in both diagnostics and surveillance. This review will discuss equine bacterial diseases of biosecurity relevance and their current diagnostic approaches, as well as their respective LAMP assay developments. Additionally, we will provide insight regarding newer technology and advancements associated with this technique and their potential use for the outlined diseases.
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Affiliation(s)
| | | | - Travis Beddoe
- Department of Animal, Plant and Soil Sciences, Centre for AgriBioscience, La Trobe University, Bundoora, VIC 3082, Australia; (A.K.); (G.Z.)
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Fatal Infection in an Alpaca (Vicugna pacos) Caused by Pathogenic Rhodococcus equi. Animals (Basel) 2022; 12:ani12101303. [PMID: 35625149 PMCID: PMC9137691 DOI: 10.3390/ani12101303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Revised: 05/05/2022] [Accepted: 05/13/2022] [Indexed: 02/04/2023] Open
Abstract
Simple Summary Serious consequences of septicemic bacterial infections include the formation of purulent and pyogranulomatous inflammation resulting in abscesses in inner organs. Different bacteria are known to cause these infections in livestock. In this study, we report in detail on a case of a fatal Rhodococcus (R.) equi infection in an alpaca (Vicugna pacos), to our knowledge, for the first time. R. equi is a member of the actinomycetes, a bacterial group known to contain several pathogenic bacteria. R. equi primarily affects equine foals and other domestic animals, but also humans, which renders this bacterium a zoonotic agent. The rhodococcal infection of the alpaca reported herein caused septicemia, resulting in emaciation and severe lesions in the lungs and heart. The onset of infection was presumably caused by aspiration pneumonia, resulting in abscesses exclusively in the lungs. The R. equi isolate proved to be pathogenic, based on the virulence gene vapA encoding the virulence-associated protein A. Antibiotic susceptibility testing revealed a susceptibility to doxycycline, erythromycin, gentamycin, neomycin, rifampicin, trimethoprim/sulfamethoxazole, tetracycline and vancomycin. This report of an R. equi infection in an alpaca makes clear that we still have knowledge gaps about bacterial infectious diseases in alpacas and potential zoonotic impacts. Therefore, the determination of pathogenic, zoonotic bacteria in alpacas is essential for treatment and preventive measures with respect to sustaining the health, welfare and productivity of this camelid species. Abstract Rhodococcus (R.) equi is a pathogen primarily known for infections in equine foals, but is also present in numerous livestock species including New World camelids. Moreover, R. equi is considered an emerging zoonotic pathogen. In this report, we describe in detail a fatal rhodococcal infection in an alpaca (Vicugna pacos), to our best knowledge, for the first time. The alpaca died due to a septicemic course of an R. equi infection resulting in emaciation and severe lesions including pyogranulomas in the lungs and pericardial effusion. The onset of the infection was presumably caused by aspiration pneumonia. R. equi could be isolated from the pyogranulomas in the lung and unequivocally identified by MALDI-TOF MS analysis and partial sequencing of the 16S rRNA gene, the 16S-23S internal transcribed spacer (ITS) region and the rpoB gene. The isolate proved to possess the vapA gene in accordance with tested isolates originating from the lungs of infected horses. The R. equi isolates revealed low minimal inhibitory concentrations (MIC values) for doxycycline, erythromycin, gentamycin, neomycin, rifampicin, trimethoprim/sulfamethoxazole, tetracycline and vancomycin in antibiotic susceptibility testing. Investigations on the cause of bacterial, especially fatal, septicemic infections in alpacas are essential for adequately addressing the requirements for health and welfare issues of this New World camelid species. Furthermore, the zoonotic potential of R. equi has to be considered with regard to the One Health approach.
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Nielsen SS, Bicout DJ, Calistri P, Canali E, Drewe JA, Garin‐Bastuji B, Gonzales Rojas JL, Gortázar C, Herskin M, Michel V, Miranda Chueca MÁ, Padalino B, Pasquali P, Roberts HC, Spoolder H, Ståhl K, Velarde A, Viltrop A, Winckler C, Baldinelli F, Broglia A, Kohnle L, Alvarez J. Assessment of listing and categorisation of animal diseases within the framework of the Animal Health Law (Regulation (EU) No 2016/429): antimicrobial-resistant Rhodococcus equi in horses. EFSA J 2022; 20:e07081. [PMID: 35136423 PMCID: PMC8808660 DOI: 10.2903/j.efsa.2022.7081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Rhodococcus equi (R. equi) was identified among the most relevant antimicrobial-resistant (AMR) bacteria in the EU for horses in a previous scientific opinion. Thus, it has been assessed according to the criteria of the Animal Health Law (AHL), in particular criteria of Article 7 on disease profile and impacts, Article 5 on its eligibility to be listed, Annex IV for its categorisation according to disease prevention and control rules as in Article 9 and Article 8 for listing animal species related to the bacterium. The assessment has been performed following a methodology previously published. The outcome is the median of the probability ranges provided by the experts, which indicates whether each criterion is fulfilled (lower bound ≥ 66%) or not (upper bound ≤ 33%), or whether there is uncertainty about fulfilment. Reasoning points are reported for criteria with uncertain outcome. According to the assessment here performed, it is uncertain whether AMR R. equi can be considered eligible to be listed for Union intervention according to Article 5 of the AHL (10-66% probability). According to the criteria in Annex IV, for the purpose of categorisation related to the level of prevention and control as in Article 9 of the AHL, the AHAW Panel concluded that the bacterium does not meet the criteria in Sections 1 and 2 (Categories A and B; 5-10% and 10-33% probability of meeting the criteria, respectively), and the AHAW Panel is uncertain whether it meets the criteria in Sections 3, 4 and 5 (Categories C, D and E; 10-66% probability of meeting the criteria in all three categories). The animal species to be listed for AMR R. equi according to Article 8 criteria are mainly horses and other species belonging to the Perissodactyla and Artiodactyla orders.
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Kahn SK, Cywes-Bentley C, Blodgett GP, Canaday NM, Turner-Garcia CE, Flores-Ahlschwede P, Metcalfe LL, Nevill M, Vinacur M, Sutter PJ, Meyer SC, Bordin AI, Pier GB, Cohen ND. Randomized, controlled trial comparing Rhodococcus equi and poly-N-acetyl glucosamine hyperimmune plasma to prevent R equi pneumonia in foals. J Vet Intern Med 2021; 35:2912-2919. [PMID: 34738651 PMCID: PMC8692225 DOI: 10.1111/jvim.16294] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 10/12/2021] [Accepted: 10/13/2021] [Indexed: 01/16/2023] Open
Abstract
Background Hyperimmune plasma raised against β‐1→6‐poly‐N‐acetyl glucosamine (PNAG HIP) mediates more opsonophagocytic killing of Rhodococcus equi (R equi) than does R equi hyperimmune plasma (RE HIP) in vitro. The relative efficacy of PNAG HIP and RE HIP to protect foals against R equi pneumonia, however, has not been evaluated. Hypothesis Transfusion with PNAG HIP will be superior to RE HIP in foals for protection against R equi pneumonia in a randomized, controlled, blinded clinical trial. Animals Four hundred sixty Quarter Horse and Thoroughbred foals at 5 large breeding farms in the United States. Methods A randomized, controlled, blinded clinical trial was conducted in which foals were transfused within 24 hours after birth with 2 L of either RE HIP or PNAG HIP. Study foals were monitored through weaning for clinical signs of pneumonia by farm veterinarians. The primary outcome was the proportion of foals that developed pneumonia after receiving each type of plasma. Results The proportion of foals that developed pneumonia was the same between foals transfused with RE HIP (14%; 32/228) and PNAG HIP (14%; 30/215). Conclusions and Clinical Importance Results indicate that PNAG HIP was not superior to a commercially available, United States Department of Agriculture‐licensed RE HIP product for protecting foals against R equi pneumonia under field conditions.
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Affiliation(s)
- Susanne K Kahn
- Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, Texas, USA
| | - Colette Cywes-Bentley
- Department of Medicine, Brigham & Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | | | | | | | | | | | | | - Mariana Vinacur
- Department of Medicine, Brigham & Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | | | | | - Angela I Bordin
- Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, Texas, USA
| | - Gerald B Pier
- Department of Medicine, Brigham & Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Noah D Cohen
- Equine Infectious Disease Laboratory, Department of Large Animal Clinical Sciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, Texas, USA
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Rocha BZLL, Portilho FVR, Garino Júnior F, Monti FDS, de Almeida BO, de Souza AAL, Morizane Y, Sakaizawa N, Suzuki Y, Kakuda T, Takai S, de Farias MR, Ribeiro MG. Cellulitis-related Rhodococcus equi in a cat harboring VAPA-type plasmid pattern. Microb Pathog 2021; 160:105186. [PMID: 34509529 DOI: 10.1016/j.micpath.2021.105186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 07/09/2021] [Accepted: 09/06/2021] [Indexed: 10/20/2022]
Abstract
Rhodococcus equi is a well-known intracellular facultative bacterium that is opportunistic in nature, and a contagious disease-causing agent of pyogranulomatous infections in humans and multihost animals. Feline rhodococcosis is an uncommon or unnoticed clinical condition, in which the organism is usually refractory to conventional antimicrobial therapy. The pathogenicity of the agent is intimately associated with plasmid-governed infectivity, which is attributed to the presence of plasmid-encoded virulence-associated proteins (Vap). Three host-adapted virulence plasmid types (VAPs) have been distinguished to date: pVAPA, pVAPB, and pVAPN, whose infections are related to equine, pig, and bovine or caprine origin, respectively, while humans are infected by all three VAP types. Most virulence studies with R. equi plasmid types in animals involve livestock species. Conversely, data on the pathogenicity and human relevance of the virulence plasmid profile of R. equi isolated from cats remains unclear. This report describes a case of cellulitis-related R. equi that harbors the pVAPA-type in a cat with cutaneous lesion. Long-term therapy of the cat using marbofloxacin, a broad-spectrum third-generation fluoroquinolone, resulted effectiveness. pVAPA is a host-adapted virulent type that has been associated predominantly with pulmonary foal infections. Our cat had a history of contact with other cats, livestock (including horses), and farm environment that could have favored the transmission of the pathogen. Besides no clear evidence of cat-to-humans transmission of the pathogen, the identification of R. equi harboring pVAPA-type in a cat with cutaneous abscessed lesion represent relevance in human health because this virulent type has been described in people worldwide with clinical rhodococcal disorders.
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Affiliation(s)
| | - Fábio Vinícius Ramos Portilho
- UNESP-São Paulo State University, Department of Animal Production and Preventive Veterinary Medicine, Botucatu, SP, Brazil.
| | | | - Fabiana Dos Santos Monti
- Graduate Program in Animal Science, School of Life Sciences, Pontifícia Universidade Católica do Paraná - PUCPR, Curitiba, PR, Brazil.
| | - Beatriz Oliveira de Almeida
- UNESP-São Paulo State University, Department of Animal Production and Preventive Veterinary Medicine, Botucatu, SP, Brazil.
| | | | - Yuri Morizane
- Kitasato University, Department of Animal Hygiene, Towada, Aomori, Japan.
| | - Naho Sakaizawa
- Kitasato University, Department of Animal Hygiene, Towada, Aomori, Japan.
| | - Yasunori Suzuki
- Kitasato University, Department of Animal Hygiene, Towada, Aomori, Japan.
| | - Tsutomu Kakuda
- Kitasato University, Department of Animal Hygiene, Towada, Aomori, Japan.
| | - Shinji Takai
- Kitasato University, Department of Animal Hygiene, Towada, Aomori, Japan.
| | - Marconi Rodrigues de Farias
- Graduate Program in Animal Science, School of Life Sciences, Pontifícia Universidade Católica do Paraná - PUCPR, Curitiba, PR, Brazil.
| | - Márcio Garcia Ribeiro
- UNESP-São Paulo State University, Department of Animal Production and Preventive Veterinary Medicine, Botucatu, SP, Brazil.
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Żychska M, Witkowski L, Klementowska A, Rzewuska M, Kwiecień E, Stefańska I, Czopowicz M, Szaluś-Jordanow O, Mickiewicz M, Moroz A, Bonecka J, Kaba J. Rhodococcus equi-Occurrence in Goats and Clinical Case Report. Pathogens 2021; 10:pathogens10091141. [PMID: 34578172 PMCID: PMC8472617 DOI: 10.3390/pathogens10091141] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 08/31/2021] [Accepted: 09/01/2021] [Indexed: 01/11/2023] Open
Abstract
Background: Rhodococcus equi infection is commonly known in equine medicine to cause frequently fatal rhodococcosis. Infections in other species and people are also reported. Clinical manifestation in goats is relatively similar to horses and humans, but data regarding bacterium prevalence are scarce. Thus, the study aimed to estimate the occurrence of R. equi in goats. Methods: During post mortem examination, submandibular, mediastinal, and mesenteric lymph nodes were collected. Standard methods were used for bacteria isolation and identification. Results: A total of 134 goats were examined, and 272 lymph node samples were collected. R. equi was isolated from four animals. All four isolates carried the choE gene, and one also had traA and pVAPN plasmid genes. Conclusions: To the authors’ best knowledge, this is the first report of R. equi occurrence and genetic diversity in goats. The results may help create a model for treating rhodococcosis in other animal species and assessing the role of meat contamination as a potential source of human infection. This research should be considered a pilot study for further application of the goat as a model of R. equi infection in horses and humans.
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Affiliation(s)
- Monika Żychska
- Division of Veterinary Epidemiology and Economics, Institute of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, 02-776 Warsaw, Poland; (M.Ż.); (A.K.); (M.C.); (M.M.); (A.M.); (J.K.)
| | - Lucjan Witkowski
- Division of Veterinary Epidemiology and Economics, Institute of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, 02-776 Warsaw, Poland; (M.Ż.); (A.K.); (M.C.); (M.M.); (A.M.); (J.K.)
- Correspondence: ; Tel.: +48-22-593-6111
| | - Agnieszka Klementowska
- Division of Veterinary Epidemiology and Economics, Institute of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, 02-776 Warsaw, Poland; (M.Ż.); (A.K.); (M.C.); (M.M.); (A.M.); (J.K.)
| | - Magdalena Rzewuska
- Department of Preclinical Sciences, Institute of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, 02-786 Warsaw, Poland; (M.R.); (E.K.); (I.S.)
| | - Ewelina Kwiecień
- Department of Preclinical Sciences, Institute of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, 02-786 Warsaw, Poland; (M.R.); (E.K.); (I.S.)
| | - Ilona Stefańska
- Department of Preclinical Sciences, Institute of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, 02-786 Warsaw, Poland; (M.R.); (E.K.); (I.S.)
| | - Michał Czopowicz
- Division of Veterinary Epidemiology and Economics, Institute of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, 02-776 Warsaw, Poland; (M.Ż.); (A.K.); (M.C.); (M.M.); (A.M.); (J.K.)
| | - Olga Szaluś-Jordanow
- Department of Small Animal Diseases with Clinic, Institute of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, 02-776 Warsaw, Poland; (O.S.-J.); (J.B.)
| | - Marcin Mickiewicz
- Division of Veterinary Epidemiology and Economics, Institute of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, 02-776 Warsaw, Poland; (M.Ż.); (A.K.); (M.C.); (M.M.); (A.M.); (J.K.)
| | - Agata Moroz
- Division of Veterinary Epidemiology and Economics, Institute of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, 02-776 Warsaw, Poland; (M.Ż.); (A.K.); (M.C.); (M.M.); (A.M.); (J.K.)
| | - Joanna Bonecka
- Department of Small Animal Diseases with Clinic, Institute of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, 02-776 Warsaw, Poland; (O.S.-J.); (J.B.)
| | - Jarosław Kaba
- Division of Veterinary Epidemiology and Economics, Institute of Veterinary Medicine, Warsaw University of Life Sciences-SGGW, 02-776 Warsaw, Poland; (M.Ż.); (A.K.); (M.C.); (M.M.); (A.M.); (J.K.)
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9
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Suzuki Y, Kubota H, Madarame H, Takase F, Takahashi K, Sasaki Y, Kakuda T, Takai S. Pathogenicity and genomic features of vapN-harboring Rhodococcus equi isolated from human patients. Int J Med Microbiol 2021; 311:151519. [PMID: 34280738 DOI: 10.1016/j.ijmm.2021.151519] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Revised: 05/20/2021] [Accepted: 07/01/2021] [Indexed: 11/16/2022] Open
Abstract
Rhodococcus equi is a saprophytic soil bacterium and intracellular pathogen that causes refractory suppurative pneumonia in foals and has emerged as a pathogenic cause of zoonotic disease. Several studies have reported human infections caused by R. equi harboring a recently described third type of virulence plasmid, the ruminant-associated pVAPN, which carries the vapN virulence determinant. Herein, we analyzed pathogenicity and genomic features of nine vapN-harboring R. equi isolated from human patients with and without HIV/AIDS. Four of these strains showed significant VapN production and proliferation in cultured macrophages. These strains were lethally pathogenic after inoculation with 1.0 × 108 CFU in mice and reproduced a necrotizing granulomatous inflammation in the liver and spleen similar to that observed in humans. Additionally, we determined entire genome sequences of all nine strains. Lengths of sequences were 5.0-5.3 Mbp, and GC contents were 68.7 %-68.8 %. All strains harbored a 120- or 125-kbp linear plasmid carrying vapN (Type I or Type II pVAPN) classified on the basis of differences in the distal sequences on the 3' side. Interestingly, VapN production differed significantly among strains harboring nearly identical types of pVAPN with variation limited to several SNPs and short base pair indels. The pVAPN sequences possessed by the VapN-producing strains did not retain any common genetic characteristics, and more detailed analyses, including chromosomal genes, are needed to further elucidate the VapN expression mechanism.
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Affiliation(s)
- Yasunori Suzuki
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Aomori, Japan.
| | - Hiroaki Kubota
- Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan
| | - Hiroo Madarame
- Laboratory of Small Animal Clinics, Veterinary Teaching Hospital, Azabu University, Kanagawa, Japan
| | - Fumiaki Takase
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Aomori, Japan
| | - Kei Takahashi
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Aomori, Japan
| | - Yukako Sasaki
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Aomori, Japan
| | - Tsutomu Kakuda
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Aomori, Japan
| | - Shinji Takai
- Laboratory of Animal Hygiene, Kitasato University School of Veterinary Medicine, Aomori, Japan
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10
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Abu-Basha EA, Bani Ismail Z, Ababneh MM, Hamzeh E, Gehring R. Pharmacokinetics and bioavailability of tildipirosin following intravenous and subcutaneous administration in horses. J Vet Pharmacol Ther 2021; 44:544-551. [PMID: 33609061 DOI: 10.1111/jvp.12958] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 01/16/2021] [Accepted: 02/04/2021] [Indexed: 12/16/2022]
Abstract
This study was designed to investigate the safety and pharmacokinetic (PK) profile of tildipirosin in horses after intravenous (i.v.) and subcutaneous (s.c.) injection of a single dose at 4 mg/kg of body weight (b.w.). A total of 12 healthy mixed breed horses were used in the study. Horses were monitored for systemic and local adverse effects, and whole blood samples were collected for hematology and plasma biochemistry analysis at time (0) and at 6, 24, and 72 h after drug administration. For PK analysis, blood samples were collected at pre-determined times before and after tildipirosin administration. Plasma concentrations of tildipirosin were determined using ultra-high-performance liquid chromatography-ultraviolet detection method (UHPLC-UV). All horses tolerated the i.v. injection of tildipirosin without showing any systemic adverse effects. However, a non-painful, soft swelling appeared at the s.c. injection site in 5 horses (41.7%). On average, tildipirosin reached a maximum plasma concentration (Cmax ) of 1257 ng/ml (geometric mean) between 0.5 and 1.5 h after s.c. administration (Tmax ). The geometric mean values for total body clearance (Cl), the apparent volume of distribution based on the terminal phase (Vz ), and the apparent volume of distribution at steady-state (Vss ) were 0.52 L/kg·h, 22 L/kg, and 10.0 L/kg, respectively. Data collected in this study suggests that tildipirosin can be used safely in horses with caution.
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Affiliation(s)
- Ehab A Abu-Basha
- Department of Basic Medical Veterinary Sciences, Faculty of Veterinary Medicine, Jordan University of Science and Technology, Irbid, Jordan
| | - Zuhair Bani Ismail
- Department of Veterinary Clinical Sciences, Faculty of Veterinary Medicine, Jordan University of Science and Technology, Irbid, Jordan
| | - Mohammed M Ababneh
- Department of Veterinary Clinical Sciences, Faculty of Veterinary Medicine, Jordan University of Science and Technology, Irbid, Jordan
| | - Eyad Hamzeh
- Faculty of Pharmacy, Jordan University of Science and Technology, Irbid, Jordan
| | - Ronette Gehring
- Department of Population Health Sciences, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
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