Lack of evidence for wild poliovirus circulation--United States, 1993.

Following the isolation of wild poliovirus type 3 during January-February 1993 among members of a religious community objecting to vaccination in Alberta, Canada, surveillance for poliomyelitis was enhanced among related communities in the United States (1). In addition, during May-July 1993, a series of surveys was conducted in seven states (Iowa, Missouri, New York, Ohio, Pennsylvania, Washington, and Wisconsin) to determine whether wild poliovirus was circulating or had circulated recently among members of these religious communities residing in the states. This report summarizes the results of these surveys.