Dawson P J, Fieldsteel A H
Proc Soc Exp Biol Med. 1975 May;149(1):61-3. doi: 10.3181/00379727-149-38743.
Prior inoculation of 7-wk-old A/He mice with the Graffi pseudotype of Friend virus protected the animals against subsequent challenge with Friend virus. Graffi leukemia virus itself did not induce protection, probably because it failed to replicate in these mice.