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Drug-susceptible tuberculosis (DS-TB) treatment is indicated:
- When susceptibility to rifampicin and isoniazid is confirmed by drug susceptibility testing (DST), or
- If the probability of resistance to rifampicin and isoniazid is low:
- while waiting for DST results for rifampicin and/or isoniazid,
- when susceptibility to rifampicin is confirmed and susceptibility to isoniazid cannot be tested.
The probability of resistance is considered low in the following situations:
- No previous TB treatment;
- No contact with a drug-resistant TB (DR-TB) patient;
- The patient comes from an area of low prevalence of resistance according to drug resistance surveys.
Patients with DS-TB should start a conventional regimen based on first-line drugs (Table 9.1) or, if eligible, an alternative regimen (Table 9.2).
All regimens for DS-TB are standard regimens.
For dosages of fixed-dose combinations, see Appendix 13.
For dosages of individual drugs, see Appendix 10.