(a).

Gram positives	Ampicillin	Ceftaroline	Doxycycline	Erythromycin	Trimethoprim-sulfamethoxazole	Daptomycin	Linezolid	Vancomycin	Cefoxitin	MLSb (erythromycin-clindamycin)
S. aureus		X	X	X	X	X	X	X	X
CoNS			X	X		X	X	X	X	X
S. lugdunensis			X	X		X	X	X	X	X
E. faecalis	X					X	X	X
E. faecium	X					X	X	X
Streptococcus spp.
S. pneumoniae
S. agalactiae