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Illinois health authorities have identified 27 cases of dengue fever as part of a broader surge in infections sweeping across the Americas, according to a recent report by the Centers for Disease Control and Prevention (CDC).

Of the reported cases in Illinois, 17 have been clustered in Cook County, underscoring concerns about the disease's spread in urban areas. The CDC issued a warning on June 25 citing a dramatic rise in dengue cases, with more than 9.7 million infections recorded in countries throughout the Americas, surpassing 2023's total by over double.

Dengue fever, caused by four closely related viruses transmitted through mosquito bites, is the most prevalent arboviral disease globally. While infection with one virus provides lifelong immunity against that strain, protection against others is temporary, lasting from months to several years, health officials explained.

Symptoms typically appear within three to ten days after exposure, with nausea, rash, joint pain, and severe headaches commonly reported among symptomatic cases. Health authorities recommend diagnostic tests-both molecular and serologic-for individuals showing symptoms, with further guidance available from local public health agencies, NBC Chicago reported.

Despite the rising cases, there are currently no approved antiviral medications for treating dengue. Medical intervention focuses on supportive care, emphasizing triage, management, and close monitoring of patients to mitigate severe outcomes.

At present, no vaccines are recommended for travelers or individuals without prior dengue virus exposure, highlighting the importance of mosquito bite prevention measures in affected regions.