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.
Bottle of diphtheria antitoxin, produced by the Hygienic Laboratory and dated May 8, 1895
Bottle of diphtheria antitoxin, produced by the Hygienic Laboratory and dated May 8, 1895