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.
Mean (with standard deviation) of the number of genomic copies of PRRSV‐1 RNA (a) and PRRSV‐2 RNA (b) in serum samples of pigs from six groups. Different letters (a, b and c) at days post challenge indicate significant differences among groups
