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.
Immunity to Norwalk-like viruses was incorrectly stated to be 14 days in a recent Public Health article.1 Immunity in fact lasts up to 14 weeks.
