Tuberculosis (TB) primarily affects the lungs. However, TB-causing bacteria can lead to pus collecting in the tissues. This is known as an abscess. Mycobacterium tuberculosis (M. tuberculosis) is the ...

If viewers have never seen a hairless rat with a pustule on its neck, or a plump fair pig with an abscess on its rump, they are in for a treat as some of National Geographic's most renowned and ...