Major Research Aim: To study novel molecular diagnostics and the pharmacokinetic variability among a spectrum of TB disease states, including severe forms of TB like disseminated TB, TB meningitis and drug resistant TB, among adults and children from multiple international sites.

Aim 1. Measure pharmacokinetics to anti-tuberculosis (TB) medications in severe TB syndromes (including multidrug-resistant TB, pediatric TB, TB sepsis and TB meningitis) from diverse geographies (including Tanzania, Uganda, Bangladesh, and Siberia) and correlate these findings to TB treatment outcome (TB treatment failure: death/ default/ relapse/ further acquired drug resistance).

Aim 2. Decipher mechanisms of pharmacokinetic variability to TB drugs, particularly malabsorption due to concurrent gastrointestinal disease.

Aim 3. Deployment of quantitative susceptibility testing (minimum inhibitory concentration-MIC) and rapid MIC-informed molecular methods (e.g., TaqMan Array Card-TAC) for M. tuberculosis.

In addition to the stated aims, the primary elements of capacity building requisite for this project include the training in and deployment of the fieldable molecular diagnostic platforms, onsite pharmacokinetic monitoring, and a broad strengthening of longitudinal cohort management for clinical research.

Inclusion Criteria:

Patients admitted to one of the study site hospitals with at least ONE of the following:

1. Clinical suspicion for TB in a child, as defined by NIH Consensus Case Definitions for TB research in children, and started on TB treatment
2. Clinical suspicion for TB meningitis, as defined by the International TB Meningitis Workshop Consensus Case Definitions for TB Meningitis
3. Clinical suspicion for TB sepsis, as defined by the Uganda/PRISM-U definitions
4. Microbiologic evidence of MDR-TB from a respiratory specimen within the past 6 months

Exclusion Criteria:

1. Pregnant women-self reported
2. Patient unable per treating physician discretion to undergo sample collection
3. Patient or representative/guardian unable to sign written informed consent
4. Patient unable to return for follow-up or be contacted by phone for follow-up

Subjects will be recruited by medical officer review of new admissions to the TB hospitals at the study sites- Kibong'oto National TB Hospital (Tanzania), Haydom Lutheran Hospital (Tanzania), Irkutsk Regional Clinical Tuberculosis Hospital (Siberia/Russian Federation), National Institute of Diseases of the Chest Hospital (Bangladesh), ICDDRB Hospital (Bangladesh), Mbarara Regional Referral Hospital (Uganda).