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.
Samples of sewage, collected from 43 nurseries and 22 main town sewers in Czechoslovakia, showed the presence of polioviruses 6-7 months after vaccination with live oral poliovaccines. The presence of other enteroviruses in sewage followed their known prevalence in the community during the summer and autumn.
