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New patient
Patient never treated for TB, or who has taken TB drugs for less than one month.
Previously treated patient
Patient who has previously taken TB drugs for one month or more.
Previously treated patients are further classified in one of the following categories:
- Relapse/recurrence
Patient whose last TB treatment outcome was "cured" or "treatment completed" (see definitions Chapter 17) and who presents a recurrent episode of TB (true relapse or reinfection).
- Treatment failure
Patient whose last TB treatment outcome was "treatment failure" (see definition Chapter 17).
- Lost to follow-up
Patient whose last TB treatment outcome was "lost to follow-up" (see definition Chapter 17).
- Other previously treated patient
Patient whose last TB treatment outcome is unknown or undocumented.