Dengue, chikungunya and Zika in Brazil

Three viruses (dengue, chikungunya and Zika) are spread by the same mosquito that is found throughout most of Brazil. So far this year, a total of 200,465 cases of Zika and 236,287 cases of chikungunya have been reported nationwide. However, dengue is by far the most serious problem with almost one and one-half million infected people.

Visit our Health Library for more information on exposure to and the prevention of Chikungunya Fever, Dengue Fever, and Zika Fever.

Advice For Travellers

Travellers should be aware that infections with these viruses occur frequently in Brazil, and each virus can cause mild to significant illness, e.g., severe dengue haemorrhagic fever due to dengue, long term physical disability due to chikungunya, and severe neurological damage in newborn infants due to Zika. Some infections result in death.

While the risk of exposure for the general traveller will vary from place to place, all travellers to Brazil where these viruses are active can reduce their risk of exposure by taking all necessary precautions to avoid mosquito bites. Many persons with dengue, chikungunya or Zika infections do not seek medical care and are not reported to health authorities. There may be many more cases in the community than the reports indicate.