Health officials have warned pregnant women to avoid travel to the more than 45 countries and territories in which the Zika virus is circulating. Infection during pregnancy can lead to birth defects in infants, particularly brain damage and abnormally small heads, called microcephaly.

But with the Olympics nearing and summer tourism in full swing, what about other travelers? What are the risks of visiting a Zika-affected country for a woman who has no plans to get pregnant — or her partner, or her child? Here are some answers to commonly asked questions.

Where is the Zika virus spreading?

Most of Latin America and the Caribbean. The Centers for Disease Control and Prevention maintains a list of affected countries. But the tally has been criticized for tarring many nations too broadly: Not every region in every country has seen Zika infections.

In particular, the yellow-fever mosquitoes that carry the virus don’t survive at elevations higher than 6,500 feet. So if your plan is to visit Mexico City or go mountain-climbing in Argentina, the odds of being bitten there are close to nil.