TABLE 3.

Phenotypic characteristics of S. porcinus isolated from human and nonhuman sources as determined by conventional physiological tests^a

Physiologic characteristic	% Positive strains:
	From nonhuman sources	From human sources
Growth in 6.5% NaCl broth	76	100
Growth at 10°C	11	37
Growth at 45°C	17	31
Utilization of piruvate	82	52
Hydrolysis of hippurate	0	63
Litmus milk (acidification/clot)	100/41	94/26
Acetoin productionb	94	100
Susceptibility to bacitracin	0	4
Production of acids from:
Glycerol	29	38
Lactose	52	0
Melibiose	23	0
MGPc	29	28

^aAll strains had positive results in the following tests: LAPase and PYRase activity; susceptibility to vancomycin, arginine, and esculin hydrolysis; and production of acids from maltose, mannitol, ribose, sorbitol, sucrose, and trehalose. All strains had negative results for hydrolysis of esculin in the presence of bile (BE reaction), starch hydrolysis, production of pigment, production of gas, motility, and production of acids from arabinose, inulin, raffinose, and sorbose.

^bVoges-Proskauer test.

^cMGP, methyl-α-d-glucopyranoside.