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Bertram MR, Vu LT, Pauszek SJ, Brito BP, Hartwig EJ, Smoliga GR, Hoang BH, Phuong NT, Stenfeldt C, Fish IH, Hung VV, Delgado A, VanderWaal K, Rodriguez LL, Long NT, Dung DH, Arzt J. Lack of Transmission of Foot-and-Mouth Disease Virus From Persistently Infected Cattle to Naïve Cattle Under Field Conditions in Vietnam. Front Vet Sci 2018; 5:174. [PMID: 30101147 PMCID: PMC6072850 DOI: 10.3389/fvets.2018.00174] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [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: 05/21/2018] [Accepted: 07/04/2018] [Indexed: 11/13/2022] Open
Abstract
Foot-and-mouth disease (FMD), caused by FMD virus (FMDV; Aphthovirus, Picornaviridae), is a highly contagious and economically important disease of cloven-hoofed domestic livestock and wildlife species worldwide. Subsequent to the clinical phase of FMD, a large proportion of FMDV-infected ruminants become persistently infected carriers, defined by detection of FMDV in oropharyngeal fluid (OPF) samples 28 days or more post-infection. The goal of this prospective study was to characterize the FMD carrier state in cattle subsequent to natural infection under typical husbandry practices in Vietnam. Ten persistently infected cattle on eight farms in the Long An province in southern Vietnam were monitored by monthly screening of serum and oropharyngeal fluid samples for 12 months. To assess transmission from FMDV carriers, 16 naïve cattle were intentionally brought into direct contact with the persistently infected animals for 6 months, and were monitored by clinical and laboratory methods. The restricted mean duration of the FMD carrier state was 27.7 months, and the rate of decrease of the proportion of carrier animals was 0.03 per month. There was no evidence of transmission to naïve animals throughout the study period. Additionally, there was no detection of FMDV infection or seroconversion in three calves born to carrier animals during the study. The force of infection for carrier-to-contact transmission was 0 per month, with upper 95% confidence limit of 0.064 per month. Phylogenetic analysis of viral protein 1 (VP1) coding sequences obtained from carriers indicated that all viruses recovered in this study belonged to the O/ME-SA/PanAsia lineage, and grouped phylogenetically with temporally and geographically related viruses. Analysis of within-host evolution of FMDV, based upon full-length open reading frame sequences recovered from consecutive samples from one animal, indicated that most of the non-synonymous changes occurred in Lpro, VP2, and VP3 protein coding regions. This study suggests that the duration of FMDV persistent infection in cattle may be longer than previously recognized, but the risk of transmission is low. Additional novel insights are provided into within-host viral evolution under natural conditions in an endemic setting.
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Affiliation(s)
- Miranda R Bertram
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, USDA, Orient Point, NY, United States.,Plum Island Animal Disease Center Research Participation Program, Oak Ridge Institute for Science and Education, Oak Ridge, TN, United States
| | - Le T Vu
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - Steven J Pauszek
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, USDA, Orient Point, NY, United States
| | - Barbara P Brito
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, USDA, Orient Point, NY, United States.,Plum Island Animal Disease Center Research Participation Program, Oak Ridge Institute for Science and Education, Oak Ridge, TN, United States
| | - Ethan J Hartwig
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, USDA, Orient Point, NY, United States
| | - George R Smoliga
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, USDA, Orient Point, NY, United States
| | - Bui H Hoang
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - Nguyen T Phuong
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - Carolina Stenfeldt
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, USDA, Orient Point, NY, United States.,STEMMA Laboratory, Veterinary Population Medicine, University of Minnesota, St. Paul, MN, United States
| | - Ian H Fish
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, USDA, Orient Point, NY, United States.,Plum Island Animal Disease Center Research Participation Program, Oak Ridge Institute for Science and Education, Oak Ridge, TN, United States
| | - Vo V Hung
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - Amy Delgado
- Monitoring and Modeling, Center for Epidemiology and Animal Health, APHIS, USDA, Fort Collins, CO, United States
| | - Kimberley VanderWaal
- STEMMA Laboratory, Veterinary Population Medicine, University of Minnesota, St. Paul, MN, United States
| | - Luis L Rodriguez
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, USDA, Orient Point, NY, United States
| | - Ngo T Long
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - Do H Dung
- Department of Animal Health, Ministry of Agriculture and Rural Development, Hanoi, Vietnam
| | - Jonathan Arzt
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, USDA, Orient Point, NY, United States
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Brito B, Pauszek SJ, Hartwig EJ, Smoliga GR, Vu LT, Dong PV, Stenfeldt C, Rodriguez LL, King DP, Knowles NJ, Bachanek-Bankowska K, Long NT, Dung DH, Arzt J. A traditional evolutionary history of foot-and-mouth disease viruses in Southeast Asia challenged by analyses of non-structural protein coding sequences. Sci Rep 2018; 8:6472. [PMID: 29691483 PMCID: PMC5915611 DOI: 10.1038/s41598-018-24870-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 04/11/2018] [Indexed: 11/09/2022] Open
Abstract
Recombination of rapidly evolving RNA-viruses provides an important mechanism for diversification, spread, and emergence of new variants with enhanced fitness. Foot-and-mouth disease virus (FMDV) causes an important transboundary disease of livestock that is endemic to most countries in Asia and Africa. Maintenance and spread of FMDV are driven by periods of dominance of specific viral lineages. Current understanding of the molecular epidemiology of FMDV lineages is generally based on the phylogenetic relationship of the capsid-encoding genes, with less attention to the process of recombination and evolution of non-structural proteins. In this study, the putative recombination breakpoints of FMDVs endemic to Southeast Asia were determined using full-open reading frame sequences. Subsequently, the lineages’ divergence times of recombination-free genome regions were estimated. These analyses revealed a close relationship between two of the earliest endemic viral lineages that appear unrelated when only considering the phylogeny of their capsid proteins. Contrastingly, one lineage, named O/CATHAY, known for having a particular host predilection (pigs) has evolved independently. Additionally, intra-lineage recombination occurred at different breakpoints compared to the inter-lineage process. These results provide new insights about FMDV recombination patterns and the evolutionary interdependence of FMDV serotypes and lineages.
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Affiliation(s)
- Barbara Brito
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, NY, USA. .,Oak Ridge Institute for Science and Education, PIADC Research Participation Program, Oak Ridge, TN, USA.
| | - Steven J Pauszek
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, NY, USA
| | - Ethan J Hartwig
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, NY, USA
| | - George R Smoliga
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, NY, USA
| | - Le T Vu
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - Pham V Dong
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - Carolina Stenfeldt
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, NY, USA.,Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, St. Paul, MN, USA
| | - Luis L Rodriguez
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, NY, USA
| | - Donald P King
- The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey, UK
| | - Nick J Knowles
- The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey, UK
| | | | - Ngo T Long
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - Do H Dung
- Department of Animal Health, Ministry of Agriculture and Rural Development, Hanoi, Vietnam
| | - Jonathan Arzt
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, NY, USA.
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Vu LT, Long NT, Brito B, Stenfeldt C, Phuong NT, Hoang BH, Pauszek SJ, Hartwig EJ, Smoliga GR, Vu PP, Quang LTV, Hung VV, Tho ND, Dong PV, Minh PQ, Bertram M, Fish IH, Rodriguez LL, Dung DH, Arzt J. First detection of foot-and-mouth disease virus O/Ind-2001d in Vietnam. PLoS One 2017; 12:e0177361. [PMID: 28599321 PMCID: PMC5466432 DOI: 10.1371/journal.pone.0177361] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Accepted: 04/17/2017] [Indexed: 01/09/2023] Open
Abstract
In recent years, foot-and-mouth disease virus (FMDV) serotype O, topotype Middle East-South Asia (ME-SA), lineage Ind-2001d has spread from the Indian subcontinent to the Middle East, North Africa, and Southeast Asia. In the current report, we describe the first detection of this lineage in Vietnam in May, 2015 in Đắk Nông province. Three subsequent outbreaks caused by genetically related viruses occurred between May–October, 2015 after which the virus was not detected in clinical outbreaks for at least 15 subsequent months. The observed outbreaks affected (in chronological order): cattle in Đắk Nông province, pigs in Đắk Lắk province and Đắk Nông province, and cattle in Ninh Thuận province. The clinical syndromes associated with these outbreaks were consistent with typical FMD in the affected species. Overall attack rate on affected premises was 0.85 in pigs and 0.93 in cattle over the course of the outbreak. Amongst 378 pigs at risk on affected premises, 85 pigs died during the outbreaks; there were no deaths among cattle. The manner in which FMDV/O/ME-SA/Ind-2001d was introduced into Vietnam remains undetermined; however, movement of live cattle is the suspected route. This incursion has substantial implications for epidemiology and control of FMD in Southeast Asia.
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Affiliation(s)
- Le T. Vu
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - Ngo T. Long
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - Barbara Brito
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, Orient Point, NY, United States of America
- Oak Ridge Institute for Science and Education, PIADC Research Participation Program, Oak Ridge, TN, United States of America
| | - Carolina Stenfeldt
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, Orient Point, NY, United States of America
- Oak Ridge Institute for Science and Education, PIADC Research Participation Program, Oak Ridge, TN, United States of America
| | - Nguyen T. Phuong
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - Bui H. Hoang
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - Steven J. Pauszek
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, Orient Point, NY, United States of America
| | - Ethan J. Hartwig
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, Orient Point, NY, United States of America
| | - George R. Smoliga
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, Orient Point, NY, United States of America
| | - Pham P. Vu
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - Le T. V. Quang
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - Vo V. Hung
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - Nguyen D. Tho
- Department of Animal Health, Ministry of Agriculture and Rural Development, Hanoi, Vietnam
| | - Pham V. Dong
- Department of Animal Health, Ministry of Agriculture and Rural Development, Hanoi, Vietnam
| | - Phan Q. Minh
- Department of Animal Health, Ministry of Agriculture and Rural Development, Hanoi, Vietnam
| | - Miranda Bertram
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, Orient Point, NY, United States of America
- Oak Ridge Institute for Science and Education, PIADC Research Participation Program, Oak Ridge, TN, United States of America
| | - Ian H. Fish
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, Orient Point, NY, United States of America
- Oak Ridge Institute for Science and Education, PIADC Research Participation Program, Oak Ridge, TN, United States of America
| | - Luis L. Rodriguez
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, Orient Point, NY, United States of America
| | - Do H. Dung
- Department of Animal Health, Ministry of Agriculture and Rural Development, Hanoi, Vietnam
- * E-mail: (JA); (DHD)
| | - Jonathan Arzt
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, Orient Point, NY, United States of America
- * E-mail: (JA); (DHD)
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Brito B, Pauszek SJ, Eschbaumer M, Stenfeldt C, de Carvalho Ferreira HC, Vu LT, Phuong NT, Hoang BH, Tho ND, Dong PV, Minh PQ, Long NT, King DP, Knowles NJ, Dung DH, Rodriguez LL, Arzt J. Phylodynamics of foot-and-mouth disease virus O/PanAsia in Vietnam 2010-2014. Vet Res 2017; 48:24. [PMID: 28403902 PMCID: PMC5390394 DOI: 10.1186/s13567-017-0424-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Accepted: 03/15/2017] [Indexed: 11/21/2022] Open
Abstract
Foot-and-mouth disease virus (FMDV) is endemic in Vietnam, a country that plays an important role in livestock trade within Southeast Asia. The large populations of FMDV-susceptible species in Vietnam are important components of food production and of the national livelihood. In this study, we investigated the phylogeny of FMDV O/PanAsia in Vietnam, reconstructing the virus' ancestral host species (pig, cattle or buffalo), clinical stage (subclinical carrier or clinically affected) and geographical location. Phylogenetic divergence time estimation and character state reconstruction analyses suggest that movement of viruses between species differ. While inferred transmissions from cattle to buffalo and pigs and from pigs to cattle are well supported, transmission from buffalo to other species, and from pigs to buffalo may be less frequent. Geographical movements of FMDV O/PanAsia virus appears to occur in all directions within the country, with the South Central Coast and the Northeast regions playing a more important role in FMDV O/PanAsia spread. Genetic selection of variants with changes at specific sites within FMDV VP1 coding region was different depending on host groups analyzed. The overall ratio of non-synonymous to synonymous nucleotide changes was greater in pigs compared to cattle and buffalo, whereas a higher number of individual amino acid sites under positive selection were detected in persistently infected, subclinical animals compared to viruses collected from clinically diseased animals. These results provide novel insights to understand FMDV evolution and its association with viral spread within endemic countries. These findings may support animal health organizations in their endeavor to design animal disease control strategies in response to outbreaks.
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Affiliation(s)
- Barbara Brito
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, Orient Point, NY, USA.,Oak Ridge Institute for Science and Education, PIADC Research Participation Program, Oak Ridge, TN, USA
| | - Steven J Pauszek
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, Orient Point, NY, USA
| | - Michael Eschbaumer
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, Orient Point, NY, USA.,Oak Ridge Institute for Science and Education, PIADC Research Participation Program, Oak Ridge, TN, USA.,Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Insel Riems, Germany
| | - Carolina Stenfeldt
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, Orient Point, NY, USA.,Oak Ridge Institute for Science and Education, PIADC Research Participation Program, Oak Ridge, TN, USA
| | - Helena C de Carvalho Ferreira
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, Orient Point, NY, USA.,Oak Ridge Institute for Science and Education, PIADC Research Participation Program, Oak Ridge, TN, USA
| | - Le T Vu
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - Nguyen T Phuong
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - Bui H Hoang
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | - Nguyen D Tho
- National Centre for Veterinary Diagnostics, Hanoi, Vietnam
| | - Pham V Dong
- Department of Animal Health, Ministry of Agriculture and Rural Development, Hanoi, Vietnam
| | - Phan Q Minh
- Department of Animal Health, Ministry of Agriculture and Rural Development, Hanoi, Vietnam
| | - Ngo T Long
- Regional Animal Health Office No. 6, Department of Animal Health, Ministry of Agriculture and Rural Development, Ho Chi Minh City, Vietnam
| | | | | | - Do H Dung
- Department of Animal Health, Ministry of Agriculture and Rural Development, Hanoi, Vietnam
| | - Luis L Rodriguez
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, Orient Point, NY, USA
| | - Jonathan Arzt
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, ARS, USDA, Orient Point, NY, USA.
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Abstract
Since the first H5N1 highly pathogenic avian influenza virus (HPAIV) infection in the region in August 2003, Cambodia, Laos, Malaysia, Myanmar, Indonesia, Thailand and Vietnam have all recorded outbreaks of the disease. The HPAIV continues to occur in some countries in Southeast Asia despite control programmes encompassing surveillance, vaccination and stamping out strategies. A number of strains have been circulating in the region since the first outbreaks in 2003, and although the source of the initial outbreaks in domestic poultry is not known, the continuing propagation of disease in the region is primarily the result of the movement of domestic poultry and poultry products, and people. A comprehensive approach using all the strategies available to break the chain of transmission of the virus in poultry will be needed to achieve lasting disease control.
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Affiliation(s)
- D Eagles
- Australian Animal Health Laboratory, PMB 24, Geelong, Victoria 3220, Australia
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Prokesová L, Dung DH, Trebichavský I, Formánková E, Stĕpánková V, John C. Antibacterial activity of human mononuclear leukocytes against Staphylococcus aureus. Folia Microbiol (Praha) 1994; 39:428-34. [PMID: 7729776 DOI: 10.1007/bf02814451] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Human mononuclear leukocytes kill Staphylococcus aureus cells in vitro. The killing of the bacteria takes place even in the absence of antibodies. The presence of antibodies (in an autologous inactivated serum) usually enhances the antibacterial activity of mononuclear leukocytes. In some cases, however, this activity is markedly decreased by the serum, probably depending of the spectrum of antibodies contained in the serum. The antibacterial activity of mononuclear leukocytes is mostly due to monocytes because their depletion causes substantial drop or the activity disappearance. We failed to demonstrate in the case of S. aureus the antibacterial cytotoxicity of T lymphocytes described by some authors dealing with Gram-negative bacteria. Large differences in the structure of the bacterial cell wall underlie apparently the different sensitivity of G+ and G- bacteria to some protective mechanisms of the host. In the antibacterial assay against S. aureus, electron microscopy revealed a maximal activation of monocytes which phagocytized the bacteria although extracellular killing is not excluded. Electronoptical findings point also to a possible participation of NK cells in the antibacterial cytotoxicity against S. aureus.
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Affiliation(s)
- L Prokesová
- 1st Medical Faculty, Charles University, Prague, Czech Republic
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Prokesová L, Dung DH, Jílek M, Vancíková Z, Lochmann O, Mára M, Bednár M, John C. Class IgG, IgM and IgA antibodies against Staphylococcus aureus antigens in human serum and saliva. Folia Microbiol (Praha) 1991; 36:502-6. [PMID: 1821877 DOI: 10.1007/bf02884073] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Using the ELISA method antibodies against the sonicate, teichoic acid (TA) and exoproducts of Staphylococcus aureus were determined in sera and saliva of healthy individuals. Main serum antibodies against all the antigens used were shown to be class IgG antibodies. However, antigens of the sonicate stimulated significantly even the systemic IgA response. In the saliva class IgA antibodies predominated, but IgG antibody levels against TA and exoproducts approached the level of IgA antibodies. Levels of IgM antibodies against all antigens tested were low in both the serum and saliva which corresponds with the anamnestic type of response. On the basis of these results one may assume that not only IgG, but also IgA antibodies are important in the systemic immunity against staphylococcal infection and in the immunity of mucous membranes; besides IgA, even class IgG antibodies play an important role.
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Affiliation(s)
- L Prokesová
- Laboratory for Special Medical Microbiology and Immunology, 1st Faculty of Medicine, Charles University, Prague, Czechoslovakia
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