As long as on medication for 2 weeks, the patient is no longer infectious. Just make sure the patient wears a surgical mask with colour ones outside.

Open all windows day/night. In the daytime, let the sun in. Sunlight kills TB bacteria. On fan. Don't use Aircon.

Getting infected is one thing. One gets infected if untreated patients speaks, laugh, cough (think those foreign workers - which is a source if TB in malaysia). The question is whether the body can eliminate the bacteria/contain it. Eliminate means no more TB bacteria in the body. Contain = control it but the bacteria is still there. May remain asymptomatic for years until one point the body defenses drop and the bacteria will multiply.

So first line of defence is preventing bacteria from entering the body via N95 mask. Normal mask gives protection of only 40% but it works very well to prevent bacteria from spreading to the environment (patient must wear it tightly).

Second and last line of defence is your own immune system. Stress, cigarette smoke, junk/fast food all will decrease your immune system.

There are certain essential oils that can decontaminate a TB room (rapidly decreasing the no of TB bacteria in the air once the essential oils have been nebulised into the air.

Hope this help to answer your question.

it is very hard for a healthy person to get infected and to have active pulmonary tb. everyone has been exposed to tb at some point of their lives'

it takes a lot of exposure and time with proximity to get infected.
anyway........if the person is missing medication or not tolerating the medication........time for a visit to the hospital/clinic.

there's only 1 type of mask that is "safe" for people handling with tb.........the n95 and above mask...........normal surgical mask do not help at all

also........if you know that you have been exposed to tb and you have a prolonged cough........better have it checked out to ensure it is not tb