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Porcine Reproductive and Respiratory Syndrome (view source)
Revision as of 17:24, 27 August 2010
, 17:24, 27 August 2010→Transmission and Epidemiology
==Transmission and Epidemiology==
==Transmission and Epidemiology==
The primary vector for transmission of the virus is the infected pig. Contact transmission has been demonstrated experimentally, and the spread of virus from infected seedstock originating from a single source has been described. Introduction of infected seedstock can lead to the introduction and coexistence of genetically diverse isolates of PRRS virus on the same farm. Controlled studies have indicated that infected swine may be longterm carriers, with adults able to shed PRRS virus for up to 86 days after infection, while weaned pigs may harbor virus for 157 days. Experimentally infected boars can shed virus in the semen up to 93 days after infection.
The primary vector for transmission of the virus is the infected pig. Contact transmission has been demonstrated experimentally, and the spread of virus from infected seedstock originating from a single source has been described. Introduction of infected seedstock can lead to the introduction and coexistence of genetically diverse isolates of PRRS virus on the same farm. Controlled studies have indicated that infected swine may be longterm carriers, with adults able to shed PRRS virus for up to 86 days after infection, while weaned pigs may harbor virus for 157 days. Experimentally infected boars can shed virus in the semen up to 93 days after infection.