TABLE 2.

Occurrence of Hlb-positive colonies after phage induction in strain 8325-4φ13 and in S. aureus isolates from CF patients harboring φ13-like phages

Strain	Occurrence of Hlb-positive coloniesa
	Ciprofloxacin		Trimethoprim		Controlb
	One-half the MIC	MIC	One-half the MIC	MIC
8325-4φ13	++	++	+	++	−
s152	++	++	ND	ND	−
i102	+	+	ND	ND	−
s87	+	++	ND	ND	−
cfs425	+	+	ND	ND	−
s126	+	+	ND	ND	−

^a++, >1% Hlb-positive colonies; +, ≤1% Hlb-positive colonies; −, Hlb-positive colonies not detectable; ND, not determined. Screening for the restitution of Hlb expression was performed on sheep blood agar plates.

^bCulture without antibiotics.