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.
The presence of antibodies against A/California/07/2009, Israeli 6B.1 and 6B.2 antigens was detected using the HI test. The figure shows the distribution of the positive cases by antibody titer (A) and their geometric mean (B). *** indicates P < 0.0001 using the Kruskal-Wallis test.
