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

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

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. 

The learner will be able to define persons who are close and household contacts of persons with TB.

Explain about important factors of Mtb. that influences the TB epidemic.

Explain about important factors of the host that influences the TB epidemic.

age, sex, immunity, co-morbidity, Nutrition, substance abuse,

Explain about the various environment factors that influence the TB Epidemic

Climate, over-crowding, pollution, socio-economoic conditions, ventilation, cultural

Positive and Negative predictive value for a test

Discuss what is meant by exposure to TB bacilli and how it happens.