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Porcine Reproductive and Respiratory Syndrome (view source)
Revision as of 18:41, 27 August 2010
, 18:41, 27 August 2010→Transmission and Epidemiology
The virus is spread by contact with infected pigs, and infection also be transmitted by infected semen. Fomites, such as contaminated needles, boots, overalls and transport vehicles can also transmit PRRS, as can certain species of insects including house flies. It has been thought that aerosol transmission may occur, particularly under conditions of high humidity, low temperatures, and low wind speeds, but this has been difficult to reproduce in the field and experimentally. Once infected, adult animals shed PRRS virus for up to 86 days, and younger, weaned pigs for 157 days. Virus excretion in semen can persist for up to 93 days after infection.
The virus is spread by contact with infected pigs, and infection also be transmitted by infected semen. Fomites, such as contaminated needles, boots, overalls and transport vehicles can also transmit PRRS, as can certain species of insects including house flies. It has been thought that aerosol transmission may occur, particularly under conditions of high humidity, low temperatures, and low wind speeds, but this has been difficult to reproduce in the field and experimentally. Once infected, adult animals shed PRRS virus for up to 86 days, and younger, weaned pigs for 157 days. Virus excretion in semen can persist for up to 93 days after infection.
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).
==Pathogenesis==
==Pathogenesis==