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.
Four men in lab gowns, head coverings, and masks are working with a machine to create ampules of typhoid vaccine; two of the men are wearing rubber gloves. A drawer with ampules is sitting on a table in front of one of the men.
Copyright:
The National Library of Medicine believes this item to be in the public domain. (More information)