The New York City Health Department announced on Monday that the West Nile virus has been reported in four people living in New York City and detected in mosquitos across all five boroughs.

The four people with West Nile virus reside in Queens and Manhattan and three of those four people were hospitalized dating back to late July, according to the health department.

According to the health department, most who are infected with West Nile do not have symptoms. Those who do have symptoms may experience fever, headache, muscle aches, rash and extreme fatigue. They add that the disease is most dangerous in the long term to those 60 years and older or those with a weakened immune system.

Data from the city's health department shows that over the last decade, 17 people on average are diagnosed with West Nile virus in New York City each year.