European PRRSpective 2023 session 2 Controlling farm breakdowns
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Dynamics of clinical signs
Following infection via inhalation of aerosolized virus, PRRS virus replicates in pulmonary alveolar macrophages in the lung.
Porcine Parvo Virus (PPV), a single-stranded-DNA virus, has been known for over 50 years and is probably the most important cause of reproductive failure worldwide1. For years PPV is controlled by vaccination in order to prevent the classical clinical signs of still born piglets and mummies that vary in size and stage of mummification. Apart from this, PPV infections also potentially cause return to estrus and birth of too small litter sizes1. Within PPV there is evolution2 and over time in Europe PPV strains are shifting from cluster A to cluster D3. Recently evidence for the presence of a cluster D strain in the Netherlands was found. This is a summary of the case and consequent findings.
Dr DiPietre analyses the economic impact of PRRS to the whole herd. He cautions that we need to re-evaluate how we measure these costs by looking closer at individual data and the impact of variation.