Eating contaminated Shellfish can be life threatening: take a look at the areas that are closed due to Sanitary Contamination!
Shellfish may be contaminated by human or animal faeces that contain bacteria or viruses hazardous to human health. Pathogens such as Norwalk virus, Hepatitis A virus, or salmonella may be concentrated in bivalve shellfish that live in sanitary contaminated areas.
Consumption risks:
Consumption of raw or partially cooked bivalve shellfish
from contaminated areas increases the risk of illness,
especially for individuals with certain medical conditions
or with compromised immune systems.
To reduce the risks:
Check to ensure that the area where you intend to harvest is
open, immediately prior to harvesting. As an added
precaution, cooking the shellfish may destroy the common
micro-organisms of public health concern.
For more information, please visit the Canadian Shellfish Sanitation Program page (Canadian Food Inspection Agency site)