Hi, TB infection latent or in early active stages in the lungs usually is only one lung and looks like a speckles of little densities. Treatment for latent TB the standard treatment is
six to nine months of isoniazid(H) alone. 6-9H
http://en.wikipedia.org/wiki/Isoniazid
The standard "short" course treatment for active TB is isoniazid, rifampicin, pyrazinamide, and ethambutol for two months, then isoniazid and rifampicin alone for a further four months.