1. AIDS
... , engulfing and digesting microbes and other foreign material in a cell-eating process called phagocytosis . They also, upon encountering an invading organism, release chemical messengers that alert other cells of the immune system and summon T lymphocytes to the scene. B lymphocytes, or B cells, serve as the body's antibody factories. Each antibody is targeted to recognize and bind to an antigen from a specific ... the immune system weakens, symptoms begin to emerge. Early Symptoms Of HIV Infection Some people, but not all, develop symptoms within a month or two of exposure to HIV. The...
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