Dermo disease confirmed in Quebec, P.E.I. oysters
The Canadian Food Inspection Agency says dermo was detected in oyster samples from Chaleur Bay in Quebec and Egmont Bay, P.E.I.
It says a different disease affecting oysters, known as MSX, was also confirmed in the Quebec samples, another first in the province.
The agency says dermo and MSX don't pose risks to human health or food safety but can cause increased oyster mortality and decreased growth rates.
Officials say dermo, also known as perkinsosis, can be transmitted from oyster to oyster or from water contaminated with the parasite.
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However, they say with MSX it's presumed there is an unknown intermediary host, making it harder to determine how it's spread.
This report by The Canadian Press was first published July 4, 2025.
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Cases of a disease affecting oysters have been confirmed in Quebec and Prince Edward Island for the first time. The Canadian Food Inspection Agency says dermo was detected in oyster samples from Chaleur Bay in Quebec and Egmont Bay, P.E.I. It says a different disease affecting oysters, known as MSX, was also confirmed in the Quebec samples, another first in the province. The agency says dermo and MSX don't pose risks to human health or food safety but can cause increased oyster mortality and decreased growth rates. Officials say dermo, also known as perkinsosis, can be transmitted from oyster to oyster or from water contaminated with the parasite. Wednesdays Columnist Jen Zoratti looks at what's next in arts, life and pop culture. However, they say with MSX it's presumed there is an unknown intermediary host, making it harder to determine how it's spread. This report by The Canadian Press was first published July 4, 2025.
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OTTAWA, ON, July 4, 2025 /CNW/ - The Canadian Food Inspection Agency (CFIA) has confirmed the presence of the aquatic animal disease Dermo (also known as Perkinsosis) in oyster samples collected in Egmont Bay, Prince Edward Island (PEI). Dermo does not pose a risk to human health or food safety, but it can cause increased oyster mortality and decreased growth rates. This is the first confirmed case of Dermo in PEI. To limit the spread of the disease, the CFIA, Fisheries and Oceans Canada (DFO) and the Province of PEI are working together with partners to monitor the situation and take necessary action. These actions are part of the Government of Canada's One Health approach to prepare for, detect, and manage animal diseases. In addition to existing robust protective measures and increased animal surveillance, the CFIA, DFO and the Province of PEI continue to conduct activities to gain insight into the presence of Dermo in the area. At this time, these response measures include: applying movement controls to oysters in the area; further investigating the potential source of the detection; engaging scientists, producers and harvesters to continue to monitor mollusc health, including notifying CFIA or the Province of sick oysters or when decreased rates of growth or increased mortalities are observed; and ensuring that information regarding detection and movement control information is available. Quick Facts Perkinsus marinus causes Dermo in cultured and wild American oysters (Crassostrea virginica). It does not affect other bivalves in this area, including mussels, scallops, or clams; however, it can cause increased oyster mortality and decreased growth rates. Dermo can be transmitted from oyster to oyster, or from water contaminated with the parasite. Dermo poses no risks to human health and is not a food safety concern. Canada's National Aquatic Animal Health Program (NAAHP), co-delivered by the CFIA and DFO, is responsible for preventing the introduction and/or spread of significant aquatic animal diseases of finfish, molluscs and crustaceans. Perkinsus marinus (Dermo) – Canadian Food Inspection Agency Perkinsus marinus ("Dermo" Disease) of Oysters – Fisheries and Oceans Canada National Aquatic Animal Health Program Facebook: CFIACanada X: @InspectionCan YouTube: @CFIA Instagram: @CFIA_Canada LinkedIn: Canadian Food Inspection Agency Each day, hard-working Canadian Food Inspection Agency employees—including inspectors, veterinarians, and scientists—inspect food for safety risks, work to protect plants from pests and invasive species, and respond to animal diseases that could threaten Canada's animal resource base and human health. Guided by science-based decision-making and modern regulations, the Agency verifies that food sold in Canada is safe while supporting access to international markets for our high-quality agricultural products. To learn more, visit
