the partial sequence information allowed us to ( 1 ) identify numerous geographic foci of endemic circulation of wild type 1 polioviruses , ( 2 ) reveal previously unsuspected links between cases in distant communities , ( 3 ) monitor the displacement from the environment of preexisting polioviruses by viruses from other regions , and ( 4 ) recognize the recombinant ( vaccine-wild ; wild-wild ) origins of some epidemic polioviruses .
C0042776
viruses
C0206435
polioviruses