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Six groups of limited flora (LF) Hartley guinea-pigs were produced by inoculation of hysterectomy-derived GF guinea-pigs with various combinations of cecal bacteria of conventional (CV) guinea-pigs to determine the effective bacterial cocktails for the establishment of a specific pathogen free (SPF) colony. Bifidobacterium magnum (Bif) isolated from CV guinea-pigs was used for pretreatment. The mortality of LF guinea-pigs inoculated with only Bif was 75%, and that of those inoculated with Bif plus chloroform-treated cecal suspension (CHF) or Bif plus CHF plus 32 isolates from CV guinea-pigs was 40 to 66.7%. These three groups were in an unhealthy condition with mucoid enteritis-like diarrhea. However, the mortality of LF guinea-pigs inoculated with the anaerobic growth on EG plates injected with 10(-5) dilution of cecal contents (CF) or inoculated with Bif plus CF was 6.3 and 15%, respectively. These latter two groups of LF guinea-pigs were transferred to separate barrier rooms and some of the LF guinea-pigs were maintained in isolators as a source of intestinal flora for SPF guinea-pigs. The composition of cecal flora of LF guinea-pigs was stable for a long time, and bacteroidaceae and peptococcaceae were maintained as predominant components. The basic composition of the cecal flora of SPF guinea-pigs originated from LF guinea-pigs, which consists mainly of the anaerobic bacteria, was not changed over a long period, and the flora composition became similar to that in CV guinea-pigs. Guinea-pig-specific pathogens from the SPF colonies were not detected during experiments.

jikken doubutsu ihou/jikken doubutsu/experimental animals/jikken dobutsu

Establishment of Specific Pathogen-Free Guinea-pig Colonies Using Limited-Flora Guinea-pigs Associated with Conventional Guinea-pig Flora, and Monitoring of their Cecal Flora.