TABLE 4.

Phenotypic characteristics of S. porcinus isolated from human and nonhuman sources, as determined by the RAPID ID 32 Strep system, and comparison with expected results and results of related species

Phenotypic characteristic	% of positive resultsa
	S. porcinus				S. agalactiae	S. pyogenes
	Strains from nonhuman sources	Strains from human sources	Total	Expected resultsb
Arginine dihydrolase	94	100	100	100	100	100
α-Galactosidase	0	0	0	80	0	0
Alanine-phenylalanine-proline-arylamidase	100	100	100	100	100	100
β-Glucosidase	76	96	88	85	0	0
β-Glucuronidase	100	100	100	0	50	0
Alcaline phosphatase	100	100	100	100	100	100
Glycyl-tryptophane arylamidase	0	5	3	0	0	0
N-Acetyl-β-glucosaminidase	0	0	0	1	0	0
Pyroglutamic acid arylamidase	12	5	8	1	0	100
Production of acids from:
Lactose	76	72	73	30	50	50
Maltose	100	100	100	100	100	100
Mannitol	82	100	92	99	0	50
Melebiose	47	0	19	0	0	0
Melezitose	0	0	0	0	0	0
Methyl-β-d-glucopyranoside	64	28	42	50	100	50
Pullulan	82	100	92	74	100	0
Raffinose	5	8	7	0	0	0
Ribose	82	100	92	80	100	50
Sucrose	100	100	100	100	100	100
Sorbitol	76	100	90	74	0	0
Tagatose	76	0	30	0	0	0
Trehalose	100	100	100	100	100	100
Acetoin production	94	100	97	100	50	0
Hydrolysis of:
Hippurate	100	92	95	1	100	0
Glycogen	0	4	2	0	0	50

^aAll strains presented negative results in tests for detecting the production of α-galactosidase, β-galactosidase, β-mannosidase, N-acetyl-β-glucosaminidase, and urease and the production of acids from cyclodextrin, d-arabitol, and l-arabinose.

^bResults indicated by the manufacturer for the identification of S. porcinus.