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.
HI antibody titers of mice immunized with pTyIrHA and challenged with HK97. Serum samples were collected at 10 days postbooster (prechallenge) and at 10 days postchallenge. There were no detectable antibodies in the serum samples collected from mice after booster. HI determinations were done with either HK97 or CkHK97 virus antigens. Each bar represents a titer from an individual mouse.
