Discuss how poor ventilation and inadequate air circulation increases risk of TB. Discuss what constitutes adequate ventilation.

Discuss how poor or waning immune response increases risk of TB infection and disease. Mention common conditions with poor host immunity.

Explain what all can be a source of TB infection and how the type of source may affect the infectiousness / risk of transmission of disease.

Discuss overcrowding and increased population density as a risk factor for TB infection and disease.