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Pathogens . . . They’ve Gone Viral !!! Part Two Applied Ag Biology Page 1 HIV vs. AIDS • HIV: Human immunodeficiency virus; causes AIDS • AIDS: Acquired immunodeficiency syndrome; disease in which a person is unable to defend his/her body vs. infections Page 2 More About HIV • HIV-infected people don’t develop AIDS symptoms until years after infection • HIV-infected individuals can feel healthy yet still spread virus to others Page 3 How is HIV Spread? • Body fluids (semen, vaginal fluid) through sexual contact • Blood (sharing of needles) • Transmitted to infants during pregnancy or through breast milk Page 4 How HIV Defeats Immune System • In healthy people, immune system attacks & destroys invaders (bacteria, virus-infected cell, cancer) • In AIDS patients, immune system is infected & destroyed by HIV • Body is unable to defend itself • AIDS patients usually die of infections that a healthy person would normally resist Page 5 Real Life Connection: • As of 2005, 1.2 million Americans were HIV positive. • As of Dec 2008, 184,4209 Californians reported contracting HIV. Of those, 85,958 have died from AIDS. Page 6