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.
Distribution of positivity (P)/negativity (N) ratios among various animal species tested for antibodies against severe fever with thrombocytopenia syndrome virus nucleoprotein, Minnesota, USA, 2012. N = mean + 3 × SD of optical density (OD)450nm values of negative controls; P = OD450nm value of a test sample.
