In some countries (e.g. ,sub-Saharan Africa,Thailand,India)(1)_________ of HIV-1 infections are acquired through heterosexual transmission in contrast to (2)_______ in the United States and Western Europe.

Question

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In some countries (e.g. ,sub-Saharan Africa,Thailand,India)more than 90% of HIV-1 infections are acquired through heterosexual transmission,in contrast to 10% or less in the United States and Western Europe.

In Some Countries (E