23 cases of West Nile virus reported in Montreal in September
Posted September 24, 2025 2:45 pm.
West Nile virus (WNV) cases have increased in Montreal over the last month, according to Public Health.
In a post on social media, the city’s health organization says 25 cases have been reported since the beginning of the year. Of those, 23 were reported in September.
This marks an uptick in cases over the last few years.
WNV is a virus that primarily lives in birds, but is commonly spread to humans through mosquito bites.
While most people don’t suffer symptoms, some people suffer more severe reactions.
Symptoms usually develop two to 14 days after a bite from a mosquito carrying the virus. Symptoms can include headaches, fever, muscle pain, nausea, vomiting, diarrhea, loss of appetite, redness on the skin with pimples, and swollen lymph nodes.
More severe cases can develop neurological disorders, which include symptoms like severe or unusual headaches, high fever, stiff neck, nausea or vomiting, drowsiness, confusion or disorientation, loss of consciousness and seizures, coordination disorders, muscle weakness, and paralysis.
Health officials say there is no specific treatment or vaccine for West Nile virus; however, most people recover without treatment. In some cases, however, WNV can cause death.
Despite this, if you experience any of the severe symptoms, seek medical attention right away.
