EESA10H3 Chapter Notes - Chapter 7: Campylobacter, Passive Immunity, Foodborne Illness

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Infectious diseases: the human body is host to many small organisms because it offers sheltered conditions and nutrients that enhance the orga(cid:374)is(cid:373)s" reprodu(cid:272)tio(cid:374). Ma(cid:374)y of these organisms are harmless, some are even helpful. For example, miasmas were thought to cause malaria (bad air): scientists who believed germs cause diseases were in the minority. Robert koch isolated anthrax bacterium and demonstrated that it produced the disease in cattle. Type of pathogens: worms can be small as 1 mm in diameter and can be more than 1 m in length. Worms are not microorganisms, even the smallest are visible to the naked eye. Parasitic works are also known as helminths: protozoa, they are microorganisms that are about 10 microns in diameter. A protozoan cell has a true nucleus that contains dna, and most protozoa can move actively in the environment. Malaria and cryptosporidiosis, affected more than 400,000 people in the 1993 waterborne disease outbreak in milwaukee.

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