Tuberculosis

Description
Tuberculosis, TB (short for tubercles bacillus) is a common and in some cases deadly infectious disease caused by various strains of mycobacteria, usually Mycobacterium tuberculosis in humans. Tuberculosis usually attacks the lungs but can also affect other parts of the body. It is commonly associated with HIV.

HIV Infection and AIDS

Definitions
HIV infection is a retrovirus infection that integrates into CD4 T lymphocytes, causing cell death and resulting in severe immunodeficiency, opportunistic infections (OI), and malignancies.

Gastroenteritis

Definitions
Gastroenteritis is a nonspecific term for various pathologic states of the gastrointestinal tract. The primary manifestation is diarrhea, but it may be accompanied by nausea, vomiting, and abdominal pain

Meningitis

Definitions
Meningitis is inflammation of the protective membranes covering the brain and spinal cord, known collectively as the meninges.