Different herd level factors associated with H1N1 or H1N2 influenza virus infections in fattening pigs

Fablet, C.; Simon, Gaëlle; Dorenlor, V.; Eono, F.; Éveno, É.; Gorin, Stéphane; Quéguiner, Stéphane; Madec, F.; Rose, Nicolas

doi:10.1016/j.prevetmed.2013.07.006

Cited by 18 publications

(19 citation statements)

References 22 publications

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“…The SIV prevalence found in intensive farms (24.13 %) is relatively low if compared to those found in previous studies 32.3 % in France (Fablet et al, 2013), 55 % in Mexico (López-Robles et al, 2014), 62.3 % in Spain (Simon-Grifé et al, 2011), 78.1 % in southern region of Brazil (Ciacci-Zanella et al, 2015), and 39.12 % in South Korea (Jeong et al, 2007).…”

Section: Discussioncontrasting

confidence: 73%

“…The odds of a herd being infected increases as the density of pigs in the herd also increases (Poljak et al, 2008). Other paper showed that large number of pigs per pen had an OR 3.2 (1.2-8.6; p < 0.05) for having H1N1-infected animals (Fablet et al, 2013). This is probably why in this paper, the chi-squared test pointed out, at animal and at herd level, significantly higher prevalence in intensive herd's animals when compared to extensive herd animals, even though it was not possible to estimate the OR value.…”

Section: Discussionmentioning

confidence: 95%

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A cross-sectional study of swine influenza in intensive and extensive farms in the northeastern region of the state of São Paulo, Brazil

Almeida

Storino

Pereira

et al. 2016

Trop Anim Health Prod

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Swine influenza (SI) is a seasonal infectious disease highly important to the world pig industry. Loss of daily weight gain, increased costs for the prevention and treatment of secondary infections are the main economic losses associated with the presence of this disease. However, some epidemiological features of SI remain quite unclear. This study focused on assessing the prevalence of swine influenza virus (SIV) infection in intensive and extensive pig herds and associating risk factors. A set of 601 blood samples of five intensive farrow-to-finish farms and 361 blood samples from 56 extensive farms were analyzed using an indirect ELISA kit CIVTEST SUIS INFLUENZA®, Hipra (Amer, Spain), in order to detect anti-SIV antibodies. In total, 24.13 % of samples from intensive herds were positive, while no positive samples were detected in extensive rearing herds. Sow and weaning piglets had the highest prevalence values. In the intensive rearing system, occurrence of reproductive disorders and exposure to recently introduced animals were positively associated with the disease occurrence in swine herds. The findings highlight the importance of sows in the epidemiology of the disease and bring information about risk factors involved in the occurrence of swine influenza in intensive herds.

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Section: Discussioncontrasting

confidence: 73%

Section: Discussionmentioning

confidence: 95%

A cross-sectional study of swine influenza in intensive and extensive farms in the northeastern region of the state of São Paulo, Brazil

Almeida

Storino

Pereira

et al. 2016

Trop Anim Health Prod

View full text Add to dashboard Cite

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“…Influenza A viruses of swine (IAV-S) are important infectious agents that contribute to porcine respiratory disease complex [ 1 – 4 ]. Pigs infected with IAV-S typically demonstrate depression, anorexia, and labored abdominal breathing [ 5 ], and IAV-S frequently are isolated from pigs showing acute clinical signs [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

“…Serologic studies on IAV-S in Canada [ 12 ], Belgium [ 1 ], France [ 4 ], Spain [ 14 , 15 ], Malaysia [ 16 ], and England [ 17 ] have found that “high number of pigs per farm or pen”, followed by “importation or purchase of pigs” and “proximity of the farm to other pig farms”, are the key risk factors for increased rates of seropositivity against IAV-S. In addition, “way of the moving pigs on the farms” and “lack of all-in–all-out management” have been suggested as risk factors for H1N1 and H1N2 IAV-S, respectively [ 4 ]. Despite these studies, how IAV-S persist in pig populations during the intervals between disease outbreaks remains unclear, because serosurveillance cannot reveal the dynamics of infection with either subclinical or epizootic IAV-S.…”

Section: Introductionmentioning

confidence: 99%

Effect of herd size on subclinical infection of swine in Vietnam with influenza A viruses

Takemae

Shobugawa

Nguyen³

et al. 2016

BMC Vet Res

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BackgroundInfluenza A viruses of swine (IAV-S) cause acute and subclinical respiratory disease. To increase our understanding of the etiology of the subclinical form and thus help prevent the persistence of IAV-S in pig populations, we conducted active virologic surveillance in Vietnam, the second-largest pig-producing country in Asia, from February 2010 to December 2013.ResultsFrom a total of 7034 nasal swabs collected from clinically healthy pigs at 250 farms and 10 slaughterhouses, we isolated 172 IAV-S from swine at the weaning and early-fattening stages. The isolation rate of IAV-S was significantly higher among pigs aged 3 weeks to 4.5 months than in older and younger animals. IAV-S were isolated from 16 large, corporate farms and 6 family-operated farms from among the 250 farms evaluated. Multivariate logistic regression analysis revealed that “having more than 1,000 pigs” was the most influential risk factor for IAV-S positivity. Farms affected by reassortant IAV-S had significantly larger pig populations than did those where A(H1N1)pdm09 viruses were isolated, thus suggesting that large, corporate farms serve as sites of reassortment events.ConclusionsWe demonstrate the asymptomatic circulation of IAV-S in the Vietnamese pig population. Raising a large number of pigs on a farm has the strongest impact on the incidence of subclinical IAV-S infection. Given that only some of the corporate farms surveyed were IAV-S positive, further active monitoring is necessary to identify additional risk factors important in subclinical infection of pigs with IAV-S in Vietnam.Electronic supplementary materialThe online version of this article (doi:10.1186/s12917-016-0844-z) contains supplementary material, which is available to authorized users.

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“…Less than half of the surveyed farms sold the whole pen each time. Others have reported the association of SI infection with a lack of all-in all-out management in the fattening room (OR 2.4, 95% CI: 1.0-5.8) (Fablet et al, 2013). When selecting and loading pigs, on 30% of the farms buyers would participate in the activity.…”

Section: Discussionmentioning

confidence: 99%

Prevalence, distribution and risk factors of farmer reported swine influenza infection in Guangdong Province, China

Edwards

Wang

et al. 2019

Preventive Veterinary Medicine

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Different herd level factors associated with H1N1 or H1N2 influenza virus infections in fattening pigs

Cited by 18 publications

References 22 publications

A cross-sectional study of swine influenza in intensive and extensive farms in the northeastern region of the state of São Paulo, Brazil

A cross-sectional study of swine influenza in intensive and extensive farms in the northeastern region of the state of São Paulo, Brazil

Effect of herd size on subclinical infection of swine in Vietnam with influenza A viruses

Prevalence, distribution and risk factors of farmer reported swine influenza infection in Guangdong Province, China

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