Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
IFN-α sensitivity of PRRSV field isolates. PAM cultures were pretreated with 1 or 100 U/ml rIFN-α. After 18 h the macrophages were washed and infected with 15 PRRSV field isolates (MOI = 0.01). After 48 h p.i. supernatants were harvested, frozen and thawed one time and infectious virus titers were analyzed in PAM cultures. This experiment was repeated twice with consistent results.
