BIOL-M 250 Lecture Notes - Lecture 37: Treponema Pallidum, Cholera Toxin, Helicobacter Pylori
Document Summary
A lot of carbon and energy on earth is sequestered(hiding or isolated) in living things. Pathogenesis is a nutritional strategy to take nutrients away from other cells. Animals with a rumen: organ containing bacteria that degrade cellulose. Cows eat fermentation acids left over from bacteria. 25% of energy we eat is consumed by bacteria. Bacteria grow but don"t harm us: may provide passive protection but largely neutral. Pathogen growns and we are harmed ving lls. Opportunistic infections: if body"s immune system is compromised commensal bacteria can become pathogens. Stretptococcus pneumoniae-- increased virulence when host has flu. Colonization: persistence of microbe in specific site within host body. Pathogen: microorganism or agent that is able to cause disease. Disease: defect in body function caused by infection. Virulence factors: bacterial products that contribute to pathogenicity. Koch"s postulates: how we determine what causes a particular disease(robert koch. Not all agents can be deliberately reintroduced to host.
