According to official figures from the Department of Health, a concerning change has emerged in the dominant dengue serotype in Puerto Rico. After the epidemic between 2024 and 2025, more cases of the DENV-03 serotype have been reported, which had been absent for over 20 years and now represents 100% of the registered infections.
Community
Dengue Serotype Absent for Over 20 Years Reemerges in Puerto Rico
At a glance
- DENV-03 serotype had been absent in Puerto Rico for over 20 years
- It now represents 100% of registered dengue infections
- The change occurred after the epidemic between 2024 and 2025
Why this matters: Puerto Rico’s history of dengue outbreaks makes this development significant for public health.
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