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Bulletin No. 19 - Fall 2004
18th IPVS Congress, Hamburg, Germany, 2004Porcine Reproductive and Respiratory Syndrome (PRRS)
DEWEY C, MELNICHOUK O, FRIENDSHIP R, HAYDEN D
Seroepidemiological study of PRRS infection patterns in nursery pigs
Proceedings of the 18th IPVS Congress, Hamburg, Germany, 2004 - Volume 1:32
In each of the 8 commercial herds included in this study, 80-120 piglets were blood sampled every week from their first week of life until 10-11 weeks of age. All samples were tested by IDEXX ELISA. Two different patterns of spread of PRRSV were observed, i.e. a rapid and a slow spread. Farms with slow spread had only 20-40% of their piglets infected by the end of the nursery stage while farms with rapid spread had already 50% of their piglets infected by 4-7 weeks of age and more than 90% at 8.5 weeks of age. The linear infection model appeared the most suitable one to explain the spread of PRRSV through the nursery period in the rapid pattern. The type of pattern (rapid or slow) was not linked to management factors.
Note from FJ: This must be related to the work done with P. Candotti and presented in European meeting (SIPAS-AFMVP) showing that high % of seropositive piglets at 9-10 weeks of age is linked with reproductive disorders due to PRRSV circulation. Final interpretation choosing between more piglets positive at weaning that contaminating more easily their penmates vs a difference in diffusibility of certain strains must be further investigated.
