Shift ranking of April 22: The oldest known computer viruses04/22/2013April 22, 20131. Creeper (1971)│ 2. Rabbit (1974)│ 3. ANIMAL (1975)│ 4. Elk Cloner (1981)│ 5. ARF-ARF (1983)│ Source: Computerworldhttps://p.dw.com/p/18Kn3Advertisement