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.
Week of onset refers to onset of symptoms when known (n = 35) or, if not available, the date of stool specimen collection (available for all cases). The filled arrow denotes the start of routine acid-fast staining for all specimens from Arctic communities; the open arrow denotes the onset of enhanced passive surveillance.
