The Centers for Disease Control and Prevention has issued a Level 1 global travel alert for dengue fever, also known as breakbone fever. The CDC is warning that travelers returning to the United States are testing positive for this mosquito-borne illness. More than 525 cases have been reported in the U.S. so far in 2026.
Dengue spreads through infected mosquito bites and causes fever, headache, nausea, vomiting, muscle and joint pain, rash, and minor bleeding. According to the CDC, although most people infected with dengue virus experience no symptoms or only mild illness, and most recover within a week, the disease can be severe and life-threatening, especially in children, older people, and those with underlying health conditions. In serious cases, symptoms include hemorrhaging, dangerously low blood pressure, and organ failure.
The CDC has identified countries with elevated risk, including Afghanistan, Bangladesh, Bolivia, Colombia, the Cook Islands, Cuba, Guyana, the Maldives, Mali, Mauritania, New Caledonia, Pakistan, Samoa, Sudan, Timor-Leste, and Vietnam. Nearly half of the world's population lives in areas where dengue is present. To reduce infection risk, the CDC recommends using insect repellent, wearing long sleeves and pants, and staying in air-conditioned or screened spaces when traveling to affected regions.
The U.S. is also tracking a new COVID-19 variant called BA.3.2. According to the CDC, this highly mutated strain has been detected in wastewater samples from 25 states, as well as in nasal swabs from four U.S. travelers and clinical samples from five patients. The variant was first identified in November 2024 in South Africa and confirmed in the United States in June 2025 in a traveler returning from the Netherlands. The BA.3.2 variant has 70 to 75 changes in its spike protein compared to older variants, and current mRNA COVID vaccines show lower antibody neutralization against it in laboratory studies. The CDC warns the actual prevalence of BA.3.2 could be higher than reported due to surveillance gaps across countries.
Additionally, measles continues spreading across the United States. The CDC reports 14 new measles outbreaks in 2026, sickening more than a thousand children, most of whom were not vaccinated. The previous flu season was classified as highly severe for children and resulted in more than 100 deaths.
Pertussis, or whooping cough, also remains a concern. The Pan American Health Organization reports that in 2025, the United States documented 28,783 confirmed and probable cases of pertussis, including 16 deaths.
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