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.
Unrooted neighbor-joining tree summarizing VP1 (nucleotides 2482 to 3384) sequence relationships among the Sabin 2 OPV strain, the Egyptian cVDPV isolates Qalyubiya/88-1 and Beni Suef/93, three Egyptian wild type 2 isolates (MEF-1/EGY42, 0317/EGY55, and 0297/EGY79), and nine wild type 2 poliovirus isolates from cases occurring in Africa, Asia, Europe, and South America from 1977 to 1991.
