Mosquito Surge Expands Across Grand Cayman

The Mosquito Research and Control Unit (MRCU) continues to respond aggressively to the recent mosquito emergence following recent rainfall and higher-than-usual tides. The surge, which began in West Bay and George Town, has now spread across all districts of Grand Cayman.

The species emerging in the greatest numbers is Aedes taeniorhynchus, also known as the black salt marsh mosquito. This mosquito is known for its aggressive biting, especially just before sunrise and just after sunset. Residents across the island should expect heavier-than-usual mosquito activity during these times.

Most of the biting is expected during those early morning and evening periods. However, if residents are experiencing unusual mosquito biting during the daytime, this may be due to a different species. MRCU encourages the public to report any unusual daytime biting by emailing mrcu@gov.ky so the team can investigate and respond appropriately.

MRCU Director Dr. Alan Wheeler said: “We are aware that mosquitoes are now emerging in all districts. While the increase is uncomfortable, it was expected based on the environmental conditions. Our team has been working hard to reduce the number of mosquitoes emerging and continues to carry out control operations to bring the numbers down as quickly as possible.”

Control operations include both truck-mounted fogging and aerial treatments, which are being conducted daily. These efforts will continue across Grand Cayman until mosquito numbers return to more acceptable levels.

MRCU collects and analyzes daily data to guide its response. This includes:

• Monitoring larvae in swamps and dykes
• Setting and analyzing mosquito traps placed in strategic locations
• Conducting property inspections
• Reviewing public complaints

Captured mosquitoes are identified by species, helping MRCU target its efforts to the types that bite or may carry disease. While there are around 20 mosquito species in the Cayman Islands, not all bite. MRCU focuses its work on nuisance and disease-carrying mosquitoes.

“We appreciate the public’s continued patience,” Dr. Wheeler added. “Our teams are working diligently to reduce the mosquito population and ease the discomfort being experienced in many areas.”

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