Serological evidence of swine influenza in Brazil

Rajão, Daniela S.; Alves, Fabiana; Puerto, Helen L. Del; Braz, Gissandra Farias; Oliveira, Fernanda Gonçalves de; Zanella, J. R. C.; Schaefer, Rejane; Reis, Jenner Karlisson Pimenta dos; Guedes, Roberto Maurício Carvalho; Lobato, Zélia Inês Portela; Leite, Rômulo Cerqueira

doi:10.1111/j.1750-2659.2012.00366.x

Cited by 22 publications

(25 citation statements)

References 10 publications

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“…In this study, antibodies against (Gonzalez and Ana 2015). In Mexico (Lopez-Robles et al 2014), 38% of pigs tested positive for SwIV antibodies in 2014 and 41.3% of Brazilian pigs were found to be positive for SwIV antibodies in a study carried out in 2012 (Rajao et al 2013). The 37% seroprevalence found in pigs of T&T is therefore consistent with similar studies carried out in Central and North American countries and suggests that SwIV is endemic in the Trinidadian domestic swine population, but not Tobago.…”

Section: Discussionsupporting

confidence: 79%

Seroprevalence of economically important viral pathogens in swine populations of Trinidad and Tobago, West Indies

Sookhoo

Jordan

Blake

et al. 2017

Trop Anim Health Prod

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The objective of this study was to evaluate the seroprevalence and identify the strains of swine influenza virus (SwIV), as well as the seroprevalence of porcine parvovirus (PPV), transmissible gastroenteritis virus (TGEV), porcine reproductive and respiratory syndrome virus (PRRSV), porcine respiratory coronavirus (PRCV), porcine circovirus type 2 (PCV-2), and classical swine fever virus (CSFV) in pigs in Trinidad and Tobago (T&T). Blood samples (309) were randomly collected from pigs at farms throughout T&T. Serum samples were tested for the presence of antibodies to the aforementioned viruses using commercial ELISA kits, and the circulating strains of SwIV were identified by the hemagglutination inhibition test (HIT). Antibodies against SwIV were detected in 114 out of the 309 samples (37%). Out of a total of 26 farms, 14 tested positive for SwIV antibodies. HI testing revealed high titers against the A/sw/Minnesota/593/99 H3N2 strain and the pH1N1 2009 pandemic strain. Antibodies against PPV were detected in 87 out of the 309 samples (28%), with 11 out of 26 farms testing positive for PPV antibodies. Antibodies against PCV-2 were detected in 205 out of the 309 samples tested (66%), with 25 out of the 26 farms testing positive for PCV-2 antibodies. No antibodies were detected in any of the tested pigs to PRRSV, TGEV, PRCV, or CSFV.

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Section: Discussionsupporting

confidence: 79%

Seroprevalence of economically important viral pathogens in swine populations of Trinidad and Tobago, West Indies

Sookhoo

Jordan

Blake

et al. 2017

Trop Anim Health Prod

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“…Anti-influenza antibodies have previously been identified in swine in Brazil, Argentina, Venezuela, Chile and Colombia. 30,31 However, only one other study has identified influenza infection (with a human H3N2 virus) in Colombian swine. 31 Early during our surveillance (February 2010), we found antibodies to classical swine H3N2 viruses in swine in the Llanos region.…”

Section: Discussionmentioning

confidence: 99%

Prevalence and characterization of influenza viruses in diverse species in Los Llanos, Colombia

Karlsson

Čiuoderis

Freiden

et al. 2013

Emerging Microbes & Infections

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While much is known about the prevalence of influenza viruses in North America and Eurasia, their prevalence in birds and mammals in South America is largely unknown. To fill this knowledge gap and provide a baseline for future ecology and epidemiology studies, we conducted 2 years of influenza surveillance in the eastern plains (Los Llanos) region of Colombia. Real-time reverse transcriptase polymerase chain reaction (RT-PCR) identified influenza viruses in wild birds, domestic poultry, swine and horses. Prevalence ranged from 2.6% to 13.4% across species. Swine showed the highest prevalence and were infected primarily with 2009 pandemic H1N1 (pH1N1) viruses genetically related to those in humans. In addition, we isolated H5N2 viruses from two resident species of whistling ducks (genus Dendrocygna) that differed completely from previous South American isolates, instead genetically resembling North American wild bird viruses. Both strains caused low pathogenicity in chickens and mammals. The prevalence and subtype diversity of influenza viruses isolated from diverse species within a small area of Colombia highlights the need for enhanced surveillance throughout South America, including monitoring of the potential transmissibility of low-pathogenic H5N2 viruses from wild birds to domestic poultry and the emergence of reassortant viruses in domestic swine.

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“…Serologic detection in 17 pig farms in Minas Gerais state by HI concluded that the IAV H1N1pdm09, H3N2 and a "human" H1N1 were circulating in at least 64.7% of the 11 studied farms (Rajao et al, 2013). A report by the same group has shown genomic sequencing data from hemagglutinin (HA) and neuraminidase (NA) genes of twenty IAV isolated from five Brazilian states farms demonstrating high nucleotide similarity to H1N1pdm09 influenza virus (Rajao et al, 2012).…”

Section: Infection Caused By Influenza Virus In Brazilian Swine Herdsmentioning

confidence: 95%

“…Th e 2009 pandemic H1N1 (H1N1pdm09) infl uenza virus is a new virus with gene segments originating from human infl uenza viruses, swine and poultry from diff erent continents (Garten et al, 2009;Smith et al, 2009). Following H1N1pdm09 identifi cation in Brazil (Rajao et al, 2013; other IAV besides H1N1pdm09 were identifi ed in swine herds in Brazil. Even with high prevalence, it is necessary to perform rapid identifi cation of circulating viruses for the understanding of the epidemiology, pathogenesis and control of new subtypes.…”

Section: Introductionmentioning

confidence: 99%

Influenza Virus Infection in Pigs

Zanella¹

2013

VR&R

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Infl uenza A virus is a zoonotic agent of great relevance to human and animal health. Swine is an important host to the dynamics and epidemiology of the infection due to its susceptibility to viruses of both the avian and mammalian virus lineages. Th e great genetic variability of infl uenza viruses is caused by two main genetic mechanisms: point mutations and gene reassortment. Th e latter, by letting the exchange of gene segments between two diff erent infl uenza viruses infecting the same cell, allows a rapid evolution of infl uenza viruses and the emergence of reassortant viruses against which there is no immunity in the host (human or animal). Infl uenza is endemic in pigs in many countries and the emergence of new viruses has been challenging its control and diagnostics. Although infections with infl uenza A virus (IAV) are endemic in most of the pork producing countries throughout the world, in Brazil this pathogen has not received much attention. Since the emergence of the 2009 pandemic H1N1 infl uenza virus in pigs (H1N1pdm09), many outbreaks of respiratory disease were observed in Brazilian swine populations. Currently, in Brazil, H1N1, H3N2 and 2009 pandemic H1N1 (A(H1N1)pdm09) infl uenza A viruses (IAVs) circulate in domestic swine herds.

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Serological evidence of swine influenza in Brazil

Cited by 22 publications

References 10 publications

Seroprevalence of economically important viral pathogens in swine populations of Trinidad and Tobago, West Indies

Seroprevalence of economically important viral pathogens in swine populations of Trinidad and Tobago, West Indies

Prevalence and characterization of influenza viruses in diverse species in Los Llanos, Colombia

Influenza Virus Infection in Pigs

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