Full text
PDFPage 1899
. 1988 Jul;54(7):1899. doi: 10.1128/aem.54.7.1899-1899.1988
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.