HIV transmission is NOT likely by which of the following exposures?

Which statement is most accurate about a pregnant woman who is HIV positive and the risk to her fetus?

What is the primary immunologic mechanism by which HIV infection increases susceptibility to opportunistic infections?

A 34-year-old business traveler had unprotected intercourse with a sex worker and is concerned about HIV. His clinician offers a fourth-generation "combo" HIV test that detects both antibodies and p24 antigen. For the most accurate result with this test, how long after the exposure should he wait before testing?

Sara is HIV-negative and wants to become pregnant with her partner Mateo, who is HIV-positive. Which of the following strategies gives Sara the lowest practical risk of acquiring HIV while still allowing conception?