Most deadly (and so far incurable) infectious disease, caused by human immunodeficiency virus (HIV)
. The HIV destroys a subgroup of white blood cells (lymphocytes) called 'T cells,' resulting in suppression of the body's immune response
. Its progression to chronic stage
causes symptoms such as severe
diarrhea, extreme fatigue
, intermittent fever, night chills and sweats, and weight
loss, leading to opportunistic infections (such as meningitis, pneumonia, tuberculosis) and/or tumors.