Full text
PDFPage 473
. 1980 Feb;39(2):473. doi: 10.1128/aem.39.2.473-473.1980
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.