Human Health and Disease
Health is more than freedom from germs. This chapter in NCERT Class 12 Biology, Chapter 7, surveys common human diseases caused by bacteria, viruses, protozoa, worms and fungi, and explains immunity, antibodies, vaccination, allergy, autoimmunity and lymphoid organs. It covers cancer, AIDS, adolescence, smoking, alcohol and drug abuse. You will learn how pathogens spread, how the immune system remembers, and which habits, hygiene and public health measures genuinely prevent illness.
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