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.
Laboratory assays to assess (A) host swimming movements per 30 s and (B) vertical position within observation chambers as a function of infection. Vertical position is measured as distance from the bottom of an observation chamber (range of 0 through 6). Error bars represent + 1 SE.
