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Microbiological monitoring on 128 inbred mouse foundation stocks consisted of common 10 inbred strains and inbred strains originated from outbred dd mice was performed by cooperation of 24 organizations. A total of 881 mice were divided into 647 conventional animals from 95 colonies and 234 barrier-sustained animals from 33 colonies. Three viral, one mycoplasmal, 6 bacterial, one fungal and 3 parasitic agents selected as monitoring microbes according to the proposed selection standards. Among conventional colonies, 84.2% were positive for at least one agent. The highest detection rate was 44.2% for S. obvelata, followed by P. pneumotropica and S. muris, P. aeruginosa, G. muris, Sendai virus, M. pulmonis, MHV and E. coli O115a, c: K (B). Of these agents, only one microbe, P. aeruginosa, was detected in barrier-sustained colonies (36.4%), thus the efficacy of barrier system for the microbiological quality control of the inbred mouse foundation stocks was actually demonstrated. The positive rates of MHV (6.3%) and Sendai v. (16.8%) were significantly low compared with those in experimental mouse colonies. Positivity for parasites was rather high and they were infested together with other pathogens in many cases. Thus parasites including G. muris, S. muris and S. obvelata were regarded as useful indicators to see microbiological contaminations in conventional mice. There observed no strain difference in susceptibility to pathogens except for C57BL/6 and AKR mice which seemed to be high antibody responders to MHV.

Microbiological Monitoring in Inbred Mouse Foundation Stocks in Japan