Doomsday Man (2000)

Dr. Tom Banks seemed to have it all: A great job, a loving brother, and a loving wife. After his wife is killed on duty while researching a deadly virus, Tom blames the government, and steals the virus, infecting himself. It is now up to his colleagues, his brother Mike and his friend Kate to track down Tom and bring the virus back safely. Tom means no harm, but the infection confuses him and brings about more problems than bargained for...