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results of a control programme for the porcine reproductive and respiratory syndrome in the french 'pays de la loire' region.the porcine reproductive and respiratory syndrome (prrs) virus first entered the pays de la loire region in november 1992, with variable effects ranging from sub-clinical seroconversion to severe reproductive failure and piglet mortality, and significant reduction of daily weight gains in finishing pigs. an epidemiological survey was carried out in february 1993. since the infection prevalence was low (11 infected out of 2310 herds), the pig population was of medium density and the eradication p ...19979220633
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