Mosquitos are thriving,and so are mosquito-borne viruses
Sarah Rennie – LJI reporter
A wet August followed by a warmer-than-usual September has become a perfect combination for an extended mosquito season.
Besides being a nuisance, mosquitos can transmit dangerous diseases such as West Nile Virus (WNV) and the California serogroup virus, as well as eastern equine encephalitis (EEE), which has surfaced locally this summer in horses despite generally being considered quite rare.
Chantal Vallée, a senior advisor with the communications and public affairs department at the Centre intégré de santé et services sociaux de la Montérégie-Centre, confirms there have been no human cases of EEE reported in the Montérégie to date. She notes, however, that an increase in WNV infections has been detected in the region.
WNV has been endemic or regularly occurring in Quebec since 2002. It is a mandatory reportable disease in Quebec, and the number of cases identified each year are recorded by the Ministère de la Santé et des Services sociaux. The number of WNV infections tends to increase cyclically every four to five years, and the province is anticipating cases may continue to rise this fall.
As of September 26, there have been 61 cases confirmed across the province, and of those, 26 were diagnosed in the Montérégie. Only 20 cases of WNV were reported in Quebec in 2023, including six in the Montérégie.
Vallée says the Direction de Santé Publique de la Montérégie (DSPM) issued a call for vigilance in August to alert health-care professionals throughout the region to the potential risks posed by these infections.
“In the presence of symptoms affecting the nervous system, health-care professionals are being encouraged to look for these infections by performing the appropriate tests,” says Vallée.
The DSPM also encourages the adoption of preventive measures, especially for people at greater risk of serious illness, including individuals over 50-years-old, and those with chronic illnesses such as diabetes, cardiovascular disease, or cancer.
Vallée confirms it is important people protect themselves against mosquito bites as long as mosquitos are active this fall.
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