Explain Why Normally Harmless Bacteria That Comprise Our Microbial Flora

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The Answer is Opportunistic infections can occur when normally harmless microflora are displaced from their normal location and access a portal of entry that is not normally available.One example is when Escherichia coli move from the colon to the urethra and cause a urinary tract infection.Another example is when a host's immune system is compromised,such as by taking certain medications or if affected by a genetic or acquired immunodeficiency,allowing establishment of an infection which would normally be prevented.

Explain Why Normally Harmless Bacteria That Comprise Our Microbial Flora

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