Mode: inhilatrion of droplets

latent Tb or non pulmonary Tb = non infective

Incubation: 2-10wks (to primary lesion or significant Mantoux)

period of infectivity; maybe years

vaccine;

live attenuated vaccine

offered to:

living in house or family with current Tb or histoyr of Tb

one or both have lived for a period of 6mo or longer with Tb rate ≥ 40/ 100 000 within last 5yrs

during first 5 years living 3months in such country