Guideline: Infection Prevention and Control Guidelines for TB, MDR-TB and XDR-TB » What are the key Patient Factors that determiine the risk of Transmission?

6. What are the key Patient Factors that determine the Risk of Transmission?


Infectiousness is dependent on the site of TB and extent of TB disease. Patients should be considered infectious if they have any of the following;

  • Cough
  • Sputum smear positive
  • Chest x-rays shows cavities in the lungs
  • Active affective TB Not on treatment
  • Just started TB treatment (on treatment less than a week)
  • Poor clinical response to TB treatment