Blue Ear — United States
The PRRS virus is highly infectious with 10 or fewer particles capable of establishing an infection when exposed by the intranasal route. Other routes (oral, vaginal, or eye) require higher doses, usually of the order of 10 3 to 10 5 particles. Breeding females can be infected with both undiluted (Yeager et al, 1993) and extended semen carrying the virus (Gradil et al, 1996).
Shedding
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Post-infection, pigs will shed the virus for extended periods in saliva (42 days), semen (43-92
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