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