CDC Warns of Dengue Spread and Measles Outbreaks While Respiratory Illness Levels Remain Low in 2025
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CDC Warns of Dengue Spread and Measles Outbreaks While Respiratory Illness Levels Remain Low in 2025
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The CDC has issued an alert regarding dengue virus activity, noting that dengue transmission remains high in parts of the Americas and within U.S. territories like Puerto Rico and the U.S. Virgin Islands. Spring and summer travel increases the likelihood of both travel-related and locally acquired dengue infections, so travelers and healthcare providers are urged to remain vigilant for dengue symptoms, particularly among people returning from regions with high transmission. The CDC has provided new guidance for testing, recommending that clinicians use the real-time RT-PCR assay when dengue is the probable diagnosis. Public health departments have access to updated resources for investigating and responding to dengue cases, even in non-endemic parts of the country. The ongoing risk also means listeners should consider mosquito bite prevention measures, especially when traveling to affected areas. This update follows a pattern of higher-than-average dengue cases globally in 2024 and 2025, according to the South Carolina Department of Public Health.
While seasonal flu activity is currently low, the CDC continues to monitor sporadic human infections with avian influenza A(H5N1) viruses. At this time, the risk to the general public is considered low, but healthcare providers are reminded to expedite influenza A subtyping in hospitalized patients, especially those in intensive care. Early identification helps prevent delays in detecting non-seasonal influenza strains, such as avian influenza.
Measles remains a concern. According to the American Medical Association, 2025 has seen a rise in measles cases across 35 jurisdictions, with 1,197 confirmed cases so far this year. There have been increases in states like Texas, California, Michigan, Montana, and the first confirmed case of the year in Arizona. While measles was officially eliminated in the United States in 2000, outbreaks continue to occur when travelers return from abroad with the infection, especially when it spreads in communities with pockets of unvaccinated individuals. The CDC has issued a Level 1 Global Travel Health Notice for measles and continues to encourage routine vaccination, particularly before international travel. The U.S. Mission to Brazil recently echoed these recommendations, highlighting the risk of infection in crowded travel settings and urging Americans to ensure they are protected.
In summary, public health alerts today emphasize continued low respiratory virus activity, a persistent dengue threat related to travel, the importance of rapid influenza identification in hospitalized cases, and ongoing vigilance and vaccination for measles. Listeners are encouraged to stay informed, practice preventive measures, and seek medical guidance if traveling or experiencing illness.
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