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West Nile fever

Health risks

Altitude sickness
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West Nile fever

West Nile fever is an infectious disease caused by the West Nile virus. The virus is transmitted through the bite of an infected mosquito. Birds are the natural carriers of the virus. Mosquitoes become infected after biting birds and can then pass the virus on to humans.

For organisations with internationally travelling employees, this risk is important to consider. Infection can lead to illness, absence from work and disruption of business activities. Good preparation and prevention help reduce these risks.

Where does West Nile fever occur?

West Nile fever occurs in several parts of the world, including Africa, Asia, the Middle East and parts of Europe and North America. In recent years, infections have also been reported more frequently in southern and eastern Europe.

Do your employees travel for work to these regions? If so, it is important to understand the health risks at the destination and take appropriate preventive measures in advance.

What are the symptoms?

Most people who are infected with the West Nile virus do not develop symptoms. If symptoms do occur, they usually appear within 2 to 14 days after a mosquito bite. Possible symptoms include:

  • Fever
  • Headache
  • Muscle and joint pain
  • Fatigue

In rare cases, serious complications can occur, such as inflammation of the brain or nervous system. This may lead to long-term absence from work. Early recognition and medical assessment are therefore important, especially for employees travelling for work.

How can you prevent West Nile fever?

There is currently no vaccine available for West Nile fever. You should therefore advise your employees to take mosquito-repellent measures. It is also advisable to monitor local news so you are aware when there is an outbreak of West Nile fever.

More information

Would you like to know more about West Nile fever? Then visit the information page of the RIVM here: West Nile fever | RIVM. Is your organisation partnered with KLM Health Services? If so, we support you with personal travel advice for your employees.