HTHSCI 2HH3 Lecture Notes - Lecture 2: Human Microbiota, Saprotrophic Nutrition, Mycobacterium
24 Sep 2018
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Many benefit the host, or simply colonize the host without causing disease. Human body: 10 trillion host cells + 100 trillion bacterial cells. When you look at someone, they are composed more of normal flora than of their own cells. Host factors greatly influence the relationship between microbe and host. Often how we respond has a lot to do with the overall health and fitness of us as well as the components of the microorganism itself. ***in the next few slides, we will briefly review the relationship between microorganisms and the healthy human host. Saprophytic mycobacteria of the ear and external genitals. Live on secretions and sloughed-off cells causing no benefit or harm to the host. Current belief is that these organisms don"t produce a benefit as well. They may produce a benefit that we haven"t been able to observe yet. Escherichia coli in the large intestine synthesize vitamin k.
