Changes

Porcine Reproductive and Respiratory Syndrome (view source)

466 bytes removed , 18:40, 27 August 2010

Line 21: Line 21:

==Pathogenesis==

−

~~Transmission of PRRS virus to swine occurs most efficiently~~

+

−

~~through direct contact. Blood, saliva, urine, milk~~

−

~~and semen from infected animals have been shown to~~

−

~~transmit PRRS virus to susceptible swine (Wills et al.,~~

−

~~1997). Aerosol transmission may occur but has proven~~

−

~~difficult to demonstrate even over relatively short distances~~

−

~~(meters). Transmission by semen, either~~

−

~~through natural service or artificial insemination is well~~

−

~~established (Yaeger et al., 1993).~~

Following exposure to PRRS virus, primary replication

occurs in regional or mucosal macrophages (Rossow,

6,502

edits