The vagina is at risk for infection because of its location and because it opens to the outside of the body. What is a protective mechanism of the vagina to keep it from becoming infected?

The correct answer is - Normal vaginal pH is acidic (4 to 5), which protects from infection.

Explanation:

The vaginal part in woman have high tendency to get infection because of moist internal condition and its location but vagina also have a protective mechanism which protect it from the infection.

A woman's vagina contains many species of Lactobacillus genus which secrete lactic acid and hydrogen peroxide that maintains the low pH level in the vagina. So due to this reason, the normal pH of the vagina remains between 4-5 which does not allow pathogenic bacteria to flourish and cause infection.