Dengue is a disease caused by a virus that is spread through mosquito bites. Dengue is found in at least 100 countries. Within North America, dengue has been found in Mexico, the continental United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands. Dengue virus is not currently found locally in Arizona; all cases to date have been travel-related. To find out if dengue is in an area you are traveling to, see the CDC’s Travelers’ Health page.
  1. Transmission
  2. Signs & Symptoms
  3. Treatment
  4. Prevention
Dengue is mainly spread through mosquito bites. Dengue is spread to people primarily through the bite of infected Aedes aegypti mosquitoes. Aedes aegypti mosquitoes are found in Maricopa County and other parts of Arizona; however, we do not have mosquitoes infected with dengue. In Arizona, dengue infections have been found only in people who were infected while traveling outside the United States. These mosquitoes bite humans all day long so it is important to protect against mosquito bites whenever you are outside.

Dengue can be spread other ways, too. In rare cases, dengue can be spread during organ transplants or blood transfusions from infected donors, and there is some evidence of spread from an infected pregnant mother to her baby.