In the section "Investigating Life: Does Natural Selection Maintain Cystic Fibrosis?," which infection did researchers hypothesize that the CFTR protected cystic fibrosis patients against?

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Researchers hypothesized that the CFTR gene mutation, which causes cystic fibrosis, protected carriers against cholera. This hypothesis is based on the idea that certain genetic diseases persist in populations because they offer a survival advantage against other diseases, in this case, cholera.

In the Section "Investigating Life: Does Natural Selection Maintain Cystic