neoplasm
• Rauscher-like murine leukemia virus (RL-MuLV)-infected germ-free mutant mice show enhanced susceptibility to leukemia development, with about 85% (15/17) incidence of leukemia at 150 days compared to about 20% (13/71) in controls
• specific-pathogen free (SPF) mice exhibit increased RL-muLV-infection induced leukemia susceptibility compared with SPF controls
• however, both germ-free and specific-pathogen free mice show a similar frequency of infected splenocytes
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