Why are women at greater risk than men for development of HIV disease as a result of heterosexual intercourse with an infected partner?
A. Women are infected with all sexually transmitted diseases more easily than men.
B. The vagina has a greater amount of mucous membrane than does the penis.
C. During childbearing years, women's immune systems are less competent so that pregnancy can occur.
D. Testosterone has a suppressive effect on viral replication and estrogen does not have this suppressive effect to the same degree.
B
HIV is most easily transmitted when infected body fluids come into contact with mucous mem-branes or nonintact skin. The vagina has much more mucous membrane than does the penis. Thus, HIV, like all other sexually transmitted diseases (STDs), is more easily transmitted from an infected male to an uninfected female than vice versa.
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