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.
Diphtheria in the city of Kalamazoo, Michigan, in 1884
Diphtheria in the city of Kalamazoo, Michigan, in 1884