CDC alerts travelers about rising dengue fever cases

In March 2025, the U.S. Centers for Disease Control and Prevention (CDC) issued a health advisory due to an alarming rise in dengue fever cases among travelers. The advisory highlighted the significant threat posed by this mosquito-borne virus, particularly as spring breakers travel to warmer climates, which coincide with peak seasonal transmission. The CDC indicated that dengue fever cases reported in Puerto Rico and the U.S. Virgin Islands have surged, particularly alarming for travelers heading to these regions. The CDC classified dengue fever as a level 1 health alert, urging the public to practice preventative measures. The heightened activity in these locations is part of a broader trend, with the agency noting that many countries have reported unusually high numbers of cases since the beginning of 2024. This situation has created an urgent need for heightened awareness amongst U.S. travelers, especially those planning trips to the Americas, where the virus is endemic. In Puerto Rico, reported cases have remained above the outbreak threshold since February 2024, with the CDC documenting over 6,291 cases during that year alone. Just as concerning, over half of those cases required hospitalization. As of early March 2025, approximately 936 new cases had already been documented, signifying a staggering 113 percent increase in cases when compared to the same period the previous year. In addition, the U.S. Virgin Islands declared a dengue outbreak in August 2024, with 208 cases confirmed in 2024 and another 30 in early 2025. With the virus posing serious health risks, the CDC also offered detailed recommendations for travelers to reduce mosquito bites, such as wearing long clothing and using insect repellent. Dengue fever, typically presenting early symptoms of fever, body aches, and vomiting, can escalate into severe forms that may include shock and even death. This ongoing emergency highlights the global health threat posed by dengue fever, particularly as more than four billion people reside in areas susceptible to this infection globally. The rising incidence of dengue infections demands urgent attention and precaution measures to safeguard public health during the busy spring and summer travel seasons.