WHO treatment categories
| Category | Regimen |
|---|---|
| E, ethambutol; H, isoniazide; R, rifampicin; S, streptomycin; Z, pyrazinamide. | |
| I. New sputum positive or severely ill sputum negative tuberculosis | 2(HERZ) 3+4(HR) 3 |
| II. Relapses, treatment failures, and defaulters | 2(SHERZ) 3+1(HERZ) 3+5(HRE) 3 |
| III. Sputum negative new cases, non-serious extrapulmonary tuberculosis | 2(HRZ) 3+4(HR) 3 |