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West Nile virus in the USA (Texas)

13 April 2022

Dallas County Health and Human Services have reported the first case of West Nile fever in the Dallas area in 2022.

West Nile fever is caused by West Nile virus (WNV) and occurs annually in the USA. The virus is spread by mosquito bites and can cause a flu-like illness and rarely, severe disease.

Advice for Travellers

Travellers should be advised to:

  • practice mosquito bite avoidance measures at all times, especially at dusk and dawn during peak transmission times and when outbreaks are known to be occurring
  • seek medical advice if they develop a sudden onset of flu-like symptoms with fever following travel to a risk area

There is no vaccine against West Nile virus.

Note for blood donors: those who have recently travelled to an area with WNV transmission may need to be tested for WNV before donating blood.

For further information see TRAVAX West Nile Fever page.