After taking antibiotics and developing a yeast infection in the genitourinary tract,the yeast infection lessens as the microbes that normally are present reestablish themselves.The reason for the lessening of the yeast infection is explained by:

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The competitive exclusion principle states that when two species compete for the same resources in the same ecological niche, one species will eventually outcompete and exclude the other. In this case, after taking antibiotics and wiping out many of the microbes present in the genitourinary tract, the yeast (Candida albicans) was able to flourish and cause an infection. However, as the normal bacteria start to reestablish themselves, they are able to compete with the yeast for resources and eventually outcompete and exclude the yeast, leading to the lessening of the infection.

After Taking Antibiotics and Developing a Yeast Infection in the Genitourinary