It's extremely important to take care not to dehydrate. On the contrary, they prevent the germs from leaving the body. In developing countries, however, it's still a very common illness and responsible for many deaths yearly, so it deserves our attention. The bacterium Mycobacterium tuberculosis. It's an airborne disease and therefore highly contagious and dangerous.
Primary tuberculosis is the first phase.
The patient is little or not aware of it, except perhaps feeling a bit like having a mild flu. Before the end of this phase some bacteria may escape from the capsules and use the bloodstream to spread through the body until they are captured once more and walled in on the spot. Most patients will not progress beyond this stage. Those who do are people whose immune system fails to wall in all the bacteria. The germs will start to multiply very rapidly and destroy lung tissue, eventually perforating the lungs.