Table. Antimicrobial drug susceptibility test results for Mycobacterium haemophilum isolate from rheumatoid arthritis patient and other M. haemophilum isolates*.

Antimicrobial drug	Case report			RIVM historic data (n = 49)
	Classification	MIC, mg/L		% Susceptible	% Resistant
Isoniazid	Resistant	10		0	100
Rifampin	Susceptible	0.2		4	96
Ethambutol	Resistant	20		0	100
Streptomycin	Susceptible	<1.0		35	65
Cycloserine	Susceptible	50		78	22
Prothionamide	Susceptible	<1.0		61	39
Amikacin	Resistant	10		29	71
Ciprofloxacin	Resistant	4.0		88	12
Clofazimine	Susceptible	<0.5		92	8
Clarithromycin	Susceptible	<2.0		94	6
Rifabutin	Susceptible	<0.2		96	4

*All isolates submitted to the Mycobacteria Reference Laboratory, National Institute for Public Health and the Environment (RIVM), the Netherlands, January 2000–January 2007. Before January 2004, strains tested were identified by 16S rDNA gene sequencing; after January 2004, strains were identified by the Inno-LiPA assay (Innogenetics, Ghent, Belgium).