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There are so many reason for the cause for leukemia. But the main cause is viral infection from the virus Human T-Lymphotropic Virus (HTLV).
The answer is leukemia
Malooney Murine Leukemia Virus.
No. There may be some cows that have the bovine version of HIV called BIV or Bovine Immunodeficiency Virus, but not all cows.
Most Likely...?