An individual who acquires an STD may well have acquired others without knowing it. The chance of a person acquiring an STD increases steeply with the number of his or her sexual partners, and with the number of sexual partners of those partners. Symptoms of STD can sometimes easily be overlooked. Simple measures are highly effective for preventing STD.
■ Name two diseases that have both sexual and nonsexual modes of transmission.
■ Why might an individual with an STD need to be checked for other STDs even though there are no symptoms of any others?
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