“Bottom line: We didn’t want to put any one person at risk,” said Eric Jacobson, the president of the trade group. Its 2017 conference is in Vancouver, British Columbia.

Other warm-weather destinations are also likely to host fewer conferences in coming years.

The Bahamas had 23 medical conferences scheduled for 2016, and has only eight thus far for next year. Costa Rica had 29 this year and has 10 for next year, the Dominican Republic had five for this year and none for next, and Florida has 1,404 for this year, and only 455 scheduled so far for next, according to figures provided by Priya Korrapati, founder of eMedEvents, which lists more than 50,000 medical conferences worldwide on its website.

Even though events can be added, most are announced at least six months in advance.

“We do see a reduction in the number of conferences being announced in places affected by Zika for the year 2017,” Ms. Korrapati said from her office in Colorado.

Among leisure travelers, some trips are being postponed until couples are done having children.

Aiyana Spahr, 33, and her husband, Erik, canceled their planned getaway from the cold of Hollis, N.H., to St. John in the U.S. Virgin Islands in February after learning she was pregnant with their second, and final, child.

“We thought about traveling to different places when we canceled our St. John trip, but I didn’t even want to risk going to Florida, so we just decided to put it off,” she said. “The baby is due at the end of the month, so we are hoping to basically do the trip to St. John some time in December or February.”

Jim Bendt, the chief executive of Pique Travel Design in Minneapolis, said he too was finding that families were reassured once they learned that the C.D.C. guidelines apply only to those who are pregnant or plan to start a family.

While he did have a cancellation this week from a couple scheduled to go on their honeymoon in Miami, others are continuing to plan trips to areas with Zika.