Full text
PDF
. 1945 Jul;50(1):117–118. doi: 10.1128/jb.50.1.117-118.1945
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.