Table 5. Comparison of drug-susceptibility and genotyping results for isolates of suspected patient pairs^a with any drug resistance.

Source-patient isolate	Secondary patient isolate (children <5 years of age)	Drug-susceptibility comparison (patient pairs)	Genotype comparison (patient pairs)
Isoniazid	Isoniazid, streptomycin	Discordant	Concordant
Isoniazid, rifampin	Isoniazid, rifampin, ethambutol, streptomycin	Discordant	Concordant
Streptomycin	Pan-susceptible	Discordant	Concordant
Streptomycin	Streptomycin	Concordant	Concordant
Isoniazid, streptomycin	Isoniazid, streptomycin	Concordant	Concordant
Pan-susceptibleb	Ethionamide	Undeterminedc	Concordant
Not done	Streptomycin	Undetermined	Undetermined

^aTuberculosis patients <5 years of age and their suspected source patients.
^bIsolate from source patient was not tested for ethionamide resistance.
^cUndetermined, results unknown for one or both patients.