Outbreaks of mosquito-borne diseases caused by have been more prevalent from 2024 to 2025. Four of the most common ones are dengue, chikungunya, Zika, and yellow fever. Knowing how they affected different communities from 2024 to 2025 can help prepare you for possible outbreaks in 2026.
Dengue
This mosquito-borne disease is the most common one worldwide. The Aedes mosquito transmits the dengue virus. The U.S. Virgin Islands and Puerto Rico had dengue outbreaks from 2024 to 2025.
California and Texas experienced dengue outbreaks in 2024. Florida had its turn in 2025. Travelers visiting these areas are at high risk of contracting the disease. Once an uninfected mosquito bites an infected individual, it acquires the dengue virus and can spread it to others through its bite. Small community outbreaks may result from this.
Chikungunya
Female mosquitoes transmit this virus. The infected ones are usually the Aedes species, which can also spread Zika and dengue. Any amount of stagnant water is enough for them to lay eggs. They can get their blood meals outdoors and indoors. An uninfected mosquito that bites an uninfected individual can acquire the chikungunya virus. A bite can then spread the infection to other individuals and other mosquitoes.
Most chikungunya patients, whether in outbreaks or isolated cases, recover. Occasionally, there are cases of lingering neurological, eye, and heart complications. Common signs and symptoms include joint pain, muscle pain, rashes, fatigue, and nausea. Misdiagnosis may occur if there is an overlap with infections, such as, Zika and dengue. When an individual recovers, there is scientific evidence showing immunity from future infections.
Yellow Fever
Studies show that this mosquito-borne disease affects many countries. That is why travelers are often required to have necessary vaccinations before entering them. South America, Africa, and Central America are the common areas to watch out for. Recently, yellow fever outbreaks have been known to affect Brazil’s major.
Yellow fever is caused by a flavivirus. This pathogen is passed on to individuals through an infected mosquito’s bite. Mosquitoes carrying this disease can bite during daytime and nighttime hours. Common symptoms include bloody urine, fever, jaundice (yellowing of the eyes or skin), as well as flu-like symptoms. These symptoms usually manifest within three to six days after the individual’s exposure to the virus.
Zika
Scientists are aware that Zika is now in the United States. Dengue and chikungunya are both spread by the same mosquito. That is why it is expected that outbreaks of Zika will occur in the U.S. as well. Hawaii and the continental U.S. had 1,658 Zika cases. This number has been reported by the CDC. The main causes of these outbreaks are accidental exposure in the lab or sexual relations.
Scientists believe that there will be a higher risk for Zika transmission in Miami and Brownsville, Florida. The Florida Keys, central Florida, and the Rio Grande Valley in South Texas are also included.
Studies show that Zika is damaging to fetuses. The effects consist of physical deformities. The autochthonous transmission will affect a small portion of the country that extends from Florida to Texas.
Outbreaks of mosquito-borne diseases are controllable and preventable. It all starts with the awareness of the problem. Finding more productive solutions to the problem can then be more encouraged. The prevalence of the given diseases must be toned down. Doing so can prevent more deaths from mosquito bites.