The only oncogenic virus whose pathogenicity has been proved without doubt is -
HTLV1 present world wide.it causes adult T cell leukemia,tropical dpadtic paraparesid.it mainly infect CD4 cells .infected cell express more inter leukin2 REF:<\p>MICROBIOLOGY ANANTHA NARAYANAN NINTH EDITION PAGE.567
HTLV - I
HTLV - II
HTLV - III
HTLV - IV
Virology