The dengue threat to the United States.

Over the past 3 decades, dengue has spread rapidly and has emerged as one of the world's most common mosquitoborne viral diseases. Although often found in tropical and semitropical areas, dengue is capable of being transmitted in temperate climates as well. Dengue is currently endemic to Mexico, most other Latin American countries, and parts of the Caribbean, and it has the potential to become reestablished as an endemic disease in the United States. In fact, sustained transmission of dengue has occurred in Florida within the past year. Conditions exist in the U.S. that could facilitate sustained dengue transmission, including environmental factors, competent mosquito vectors, limited vector and dengue surveillance, increased domestic outdoor daytime activities in warmer months, and low public awareness of the disease. If dengue were to be reestablished in the U.S., it could have significant medical, public health, and economic consequences for the country. The impact of dengue as a public health threat could be lessened through enhanced awareness and reporting of cases, increased support for vector surveillance and control programs, and a greater focus on vaccine development.