Dengue is a risk in many parts of Central and South America, Mexico, and the Caribbean. Some countries are reporting increased numbers of cases of the disease. Travelers to the Americas can protect themselves by preventing mosquito bites.

Widespread ongoing transmission of a respiratory illness caused by the novel coronavirus (COVID-19) is occurring globally. CDC recommends that travelers avoid all nonessential international travel.

CDC recommends that travelers defer all cruise travel worldwide.

Dengue is a risk in many parts of Asia and the Pacific Islands. Some countries are reporting increased numbers of cases of the disease. Travelers to Asia and the Pacific Islands can protect themselves by preventing mosquito bites.

There are polio outbreaks in several countries in Africa. CDC recommends that all travelers to these countries be vaccinated fully against polio.