Apr 10, 2020

On reproductive and respiratory syndrome virus dissemination across pig production systems in the United States

BioRxiv : the Preprint Server for Biology
M. JaraGustavo Machado

Abstract

Porcine reproductive and respiratory syndrome virus (PRRSv) remains widespread in the North American pig population. Despite improvements in virus characterization, it is unclear whether PRRSv infections are a product of viral circulation within a farm, within production systems (local) or across production systems (external). Here we examined the dissemination dynamics of PRRSv and the processes facilitating its spread within and among pig farms in three production systems. Overall, PRRSv genetic diversity declined since 2018, while phylodynamic results support frequent transmission across-production systems. We found that PRRSv dissemination occurred mostly through transmission between farms of different production companies, which were predominant for several months, especially from November until May when PRRSv tends to peak in the studied region. Within production systems, dissemination occurred mainly through regular pig flow, (from sow to nursery and then to finisher farms); nevertheless, an important flux of PRRSv dissemination from finisher to sow and nursery farms highlighted the importance of downstream farms as sources of the virus. High density of farms and farms near major roads were more likely to infect by PRRSv...Continue Reading

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Mentioned in this Paper

Calcinus elegans
Cyartonema elegans
Study
Coleonyx elegans
Cestrum elegans
Clarkia unguiculata
Clathrulina elegans
Cardioglossa elegans
Cymbella elegans
Cyrenella elegans

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