| jc virus strains indigenous to northeastern siberians and canadian inuits are unique but evolutionally related to those distributed throughout europe and mediterranean areas. | human polyomavirus jc virus (jcv) isolates around the world are classified into more than 10 geographically distinct genotypes (designated as subtypes). evolutionary relationships among jcv subtypes were recently examined, and the following pattern of jcv evolution was indicated. the ancestral jcv first divided into three superclusters, designated types a, b, and c. a split in type a generated two subtypes, eu-a and -b, containing mainly european and mediterranean isolates. the split in type b g ... | 2002 | 12187385 |