80% of infections are asymptomatic. 20% of infected patients show a flu-like illness with sudden, high fever, muscle aches and headaches and possibly swelling of the lymph nodes and skin spots. In individual cases, neurological forms of the disease occur, which can be accompanied by inflammation of the meninges and brain, clouding of consciousness, coordination disorders, difficulty swallowing, extreme fatigue and dizziness combined with behavioural and personality changes. Immunocompromised patients and people over the age of 50 have a higher risk of developing the severe form of the disease.

Compared to last year, there are more West Nile virus infections in humans in many parts of Europe this year, including Austria. All of the infections detected affect eastern Austria. The risk of infection for the population is low.

There is no vaccine for humans. To prevent infection, gel bites should be avoided as far as possible.
Several authorised vaccines are available for horses. Regular booster vaccinations are necessary. In clinically ill horses, the infection is fatal in up to 40% of animals. Common symptoms of West Nile virus infection are fever, lethargy, head propping, weakness of the hindquarters, general muscle weakness, loss of appetite, visual disturbances and paralysis.

Compared to last year, there are also more West Nile virus infections in horses and birds this year. In addition, the first cases in animals occurred two months earlier than in previous years.

Current figures on infections in humans and animals and evidence in mosquitoes can be found here:

More information on West Nile Virus
AGES radar for infectious diseases
AGES animal disease radar