TABLE 1.

Resistance frequency of seven T. rubrum strains to terbinafine

Strain	Background	Total CFU plated	No. of resistant colonies	Resistance frequency
NFI 1895	Clinical straina	4.8 × 108	1	2.1 × 10−9
NFI 5132	Onychomycosis	4.0 × 108	2	5.0 × 10−9
NFI 5139	Tinea pedis	4.5 × 108	1	2.2 × 10−9
NFI 5140	Tinea pedis	5.8 × 108	1	1.7 × 10−9
NFI 5141	Tinea pedis	2.3 × 109	2	8.8 × 10−10
NFI 5143	Onychomycosis	4.0 × 108	1	2.5 × 10−9
NFI 5182b	Dermatophytosis	9.2 × 108	4	4.3 × 10−9

^aExact infection type unknown. All strains were isolated from different patients; strains NFI 5139, NFI 5140, and NFI 5141 were isolated before patients were treated. The exact clinical background of the patients from which the other strains were isolated is unknown.

^bNFI 5182 corresponds to the ATCC 18759.