DOH-Duval Extends Blue Green Algae Health Alert for St. Johns River - Mandarin Point
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The Florida Department of Health in Duval County (DOH-Duval) has extended a health alert for the presence of harmful blue-green algae toxins in the St. Johns River. The alert is in response to a water sample taken on October 14, 2025. The public should exercise caution in and around St. Johns River near Mandarin Point.
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Mosquito-borne diseases can be spread through the bite of mosquitoes. These diseases may be caused by a virus, also known as arboviruses, or can be caused by parasites. Several of the mosquito species found in Florida are capable of transmitting diseases to humans, horses, and other animals. Symptoms of these illnesses can range from mild to very severe.
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