Methicillin-Resistant Staphylococcus aureus (MRSA) in Artisanal Cheeses in México

Table 4

Methicillin resistance and enterotoxin A production in S. aureus biotypes.

Biotype	MRSA, n (%), N = 8	seA, n (%), N = 8
Host-specific ecovars
Human ecovar	—	—
Human ecovar β+^∗	2 (25)	—
Poultry ecovar	1 (12.5)	1 (12.5)
Bovine ecovar	—	—
Ovine ecovar	—	—
Nonhost-specific (NHS) biotypes
K − β + CV: C^∗	—	1 (12.5)
K − β + CV: A^∗	—	2 (25)
K + β − CV: A^∗	1 (12.5)	4 (50)
K + β + CV: A^∗	4 (50)	—
K − β − CV: C^∗	—	—

^∗Abbreviations are derived from staphylokinase (K), β-haemolysin (β), and crystal violet (CV) growth type. NHS biotypes in this study correspond to the following: K − β + CV: C (biotype A), K − β + CV: A (biotype β), K + β − CV: A (biotype C), K + β + CV: A (biotype D), and K − β − CV: C (biotype E). MRSA, methicillin-resistant Staphylococcus aureus. SeA, enterotoxin A-producing Staphylococcus aureus.