Microcheck 197

Serum-resistant bacteria can avoid the killing effects of complement. Mechanisms bacteria use to avoid destruction by phagocytes include preventing encounters with phagocytes, avoiding recognition and attachment, and surviving within the phagocyte. Mechanisms for avoiding antibodies include IgA protese, antigenic variation and mimicking host molecules.

■ Describe the effects of the Fc receptor on the surface of a bacterial cell.

■ Describe three mechanisms that bacteria can use to survive within a phagocytic cell.

■ Encapsulated organisms can be phagocytized once antibodies against the capsule have been formed. Why would this be so?

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