Microcheck 118

Staphylococcus species are able to thrive in the dry, salty conditions of the skin. Bacteroides and Bifidobacterium species reside in the gastrointestinal tract; Campylobacter and Helicobacter species may cause disease when they

11.9 Archaea that Thrive in Extreme Conditions 293

reside there. Neisseria species, mycoplasma, and spirochetes inhabit other mucous membranes. Obligate intracellular parasites including Rickettsia, Orientia, Ehrlichia, Coxiella, and Chlamydia species are unable to reproduce outside of a host cell.

■ What characteristic of Mycoplasma species separates them from other bacteria?

■ How is Helicobacter pylori able to withstand the acidity of the stomach?

■ Why would breast feeding affect the composition of a baby's intestinal flora?

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