A small number of people (less than 1%) who are infected with West Nile virus do become seriously ill, though. They are usually people over the age of 50 who are at greater risk of developing a more severe form of the infection, such as encephalitis or meningitis.
Answer:
Severe illness can occur in people of any age; however, people over 60 years of age are at greater risk. People with certain medical conditions, such as cancer, diabetes, hypertension, kidney disease, and people who have received organ transplants, are also at greater risk.
