Table I.

Aerobic, facultative anaerobic, and anaerobic cecal cultures from RF and SPF mice^a

		Aerobic Culture
Isolate Description	Identification	RF-1	RF-2	RF-3	RF-4	SPF-1	SPF-2	SPF-3	SPF-4
Gram-positive pleomorphic rod	Lactobacillus spp.	Many	Many	Many	Modb	Mod	Mod	Many	Few
Gram-positive, coagulase-negative cocci in clusters	Staphylococci coagulase negative	few	Mod	Few	Mod	Few	Few	Many	Few
Gram-positive, γ-hemolytic, catalase-negative cocci in pairs and chains	Enterococcus spp.					Few	Rare	Many	Few
Gram positive, á-hemolytic, catalase negative cocci in pairs and chains	Enterococcus-like organism					Rare	Rare	Rare
Gram-positive rod (possible two morphotypes wrinkled and mucoid)	Bacillus spp.					Rare	Rare	Rare (mucoid)	Rare (mucoid)
Gram-negative, lactose-positive rod (possible two morphotypes)	Enterobacter cloacae							Few	Few
Large Gram-negative rod	B. fragilis group	Mod	Mod	Many	Many	Mod	Mod	Many	Mod
Unusual Gram- negative rod but SSR indicating Gram-positive organism	Possible Prevotella spp.	Many	Many	Many	Many
Anaerobic Gram -positive rod (SRS, flat regular)	Gram-positive rod 1		Many	Many
Anaerobic Gram-positive rod (SRS, flecked colony)	Gram-positive rod 2								Mod
Anerobic Gram -positive rod (SRS, small)	Gram-positive rod 3							Many
Anaerobic Gram- negative rod (RSS resistant to vancomycin)	Fusobacteriumspp.					Few

^aEach column (RF-1, RF-2, etc.; SPF-1, SPF-2, etc.) presents results from cultures of individual RF and SPF mice, respectively.

^bMod, Moderate; S, susceptible and R, resistant to vancomycin (5 μg), colistin (10 μg), and kanamycin (1,000 μg), respectively.