Prevalence of primary drug resistance in 32 countries and regions

Abridged information from a global project on antituberculosis drug resistance surveillance undertaken by WHO and IUATLD between 1994 and 1997.35 countries across the 5 continents participated in the project

Value type	Drug resistance
	Isoniazid		Rifampicin		Ethambutol		Streptomycin
	Single	Any	Single	Any	Single	Any	Single	Any
Median	3.2	7.3	0.2	1.8	0.3	1.0	2.5	6.5
Minimum	0	1.5	0	0	0	0	0	0.3
Maximum	8.6	31.7	6.9	16.8	3.6	9.9	13.7	28.0

* Single denotes resistance only to the drug in question;any denotes resistance to the drug in question with or without resistance to other drugs