Costa Rica is a tropical country, so it is no surprise that mosquitoes exist here. Don’t worry – there is no infestation. However, there are some mosquito species that can transmit diseases. It is therefore important to know which diseases exist and how you can protect yourself.
In this article, you will learn which diseases mosquitoes can transmit in Costa Rica, how to recognize them, what symptoms occur, how to prevent infection, and how these diseases are treated.
In Costa Rica, there are three mosquito-borne diseases: Dengue, Zika, and Chikungunya.
All three are transmitted by mosquitoes of the Aedes genus, which can be identified by the white markings on their legs. It is also important to know that Aedes mosquitoes are active during the daytime.
Dengue
Dengue fever is transmitted by the Aedes aegypti and Aedes albopictus mosquitoes. They mainly live in urban areas. Their larvae develop in standing water, such as in flower pots, empty cans, or car tires. This is why the risk of infection is higher during the rainy season in Costa Rica.
If you are staying in the Central Valley (San José, Heredia, or Alajuela) during this time, you should avoid sitting in gardens without mosquito protection.
There are different forms of dengue:
- Mild form: flu-like symptoms such as fever, headaches, and body aches. These appear 3-10 days after infection and usually resolve without consequences after several days or weeks.
- Severe form: can lead to a dangerous shock accompanied by high fever, anxiety, cold sweats, heart rhythm disturbances, and blood clotting disorders. This form can be life-threatening, but with treatment, the survival rate is about 99%.
There is a vaccine for people who have already had dengue once. Unfortunately, there is currently no preventive vaccine. With proper precautions and effective mosquito repellent, you can enjoy your stay in Costa Rica without worry.
For more information, visit the US Centers for Disease Control and Prevention (CDC).
Zika
The Zika virus is transmitted by the daytime-active Aedes aegypti mosquito. The virus is particularly dangerous for unborn children, as it can cause fetal malformations, including a smaller head circumference.
Typical symptoms include fever, skin rash, joint pain, and headaches, appearing 3–7 days after infection.
By July 2018, Costa Rica had reported 295 cases. During the same period in 2019, only 89 cases were recorded, representing a significant decrease.
There is a vaccine to protect against Zika. In the case of infection, symptoms usually last about one week and then resolve on their own. Pregnant women and couples planning a pregnancy should carefully consider the timing of their trip.
Chikungunya
Chikungunya is transmitted by the Aedes (Stegomyia) aegypti mosquito. The larvae also develop in standing water, such as flower pots, empty cans, and car tires.
About 2–12 days after infection, patients experience fever, skin rash, and severe joint pain. Symptoms usually resolve on their own after around 10 days and result in lifelong immunity.
In 2019, 60 cases were reported in Costa Rica by July, compared to 87 cases during the same period in 2018.
There is no vaccine and no specific treatment to prevent infection. If infected, treatment focuses on relieving symptoms. As the symptoms of Zika, Chikungunya, and Dengue are very similar, a blood test is required for an accurate diagnosis.
Yellow Fever
Costa Rica is not affected by yellow fever. However, travelers who have visited countries classified as yellow fever risk areas by the World Health Organization (WHO) must present an international yellow fever vaccination certificate upon entry.
The vaccination must be administered at least 10 days before entry to ensure protection. If this period is shorter, entry into Costa Rica is not guaranteed.
Transit through a risk country without receiving an entry stamp does not require proof of vaccination.
Malaria
Fortunately, malaria is not a major issue in Costa Rica. In recent years, only a few isolated cases have been reported, mainly in Limón. Malaria prophylaxis is not necessary when traveling to Costa Rica.
How to Protect Yourself from Mosquito Bites
- Use mosquito repellent with 20-30% DEET or 20% Picaridin
- Wear light-colored, loose-fitting clothing
- Be extra cautions in coastal areas and near water
- Apply sunscreen first, then mosquito repellent about 20 minutes later
What Should I Do If I Get Infected?
If you experience symptoms and are concerned that you may have one of these diseases, see a doctor and mention that you have visited a tropical country. A blood test can determine whether you have been infected with Dengue, Zika, or Chikungunya, allowing appropriate treatment.
Conclusion:
Mosquitoes should not be a reason to avoid traveling to Costa Rica. With basic precautions, you can enjoy your trip without concern.
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