WATERLOO REGION — Oysters and clams sold in stores in Waterloo and Cambridge are included in a voluntary recallby the Canadian Food Inspection Agency.

Shellfish harvested in Connecticut are contaminated with naturally occurring bacteria. Agriculture officials theresay raw or undercooked shellfish from certain harvest areas have been implicated in illnesses caused by Vibrio parahaemolyticus.

Canadian officials issued a warning Wednesday to the public not to consume certain oysters and clams sold in Ontario and Quebec.

Vibrio parahaemolyticus may not look or smell spoiled, federal officials say.

Eating contaminated food may cause vibriosis, a foodborne illness. Symptoms include watery and/or bloody diarrhea, abdominal cramps, nausea, vomiting, headache, fever, and chills.

Symptoms usually appear about 12 to 24 hours after eating contaminated food, but the onset can range from four to 96 hours.

Severe illness is rare and occurs more commonly in persons with weakened immune systems.

Here's shellfish included in the Canadian recalland where they were sold, according to the food inspection agency.

Cherrystone clams

(sold July 3, 2013 to Aug. 6, 2013)

Sobeys, 94 Bridgeport Rd., Waterloo ON

Zehrs, 200 Franklin Blvd., Cambridge ON

Loblaw, 3040 Wonderland Rd. S, London ON

Real Canadian Superstore, 30 Kingston Rd. W., Ajax ON

Real Canadian Superstore, 1385 Harmony Rd. N., Oshawa ON

Real Canadian Superstore, 361 South Service Rd., Grimsby ON Loblaw, 1740 Richmond St. N., London ON

Real Canadian Superstore, 825 Oxford St. E., London ON

Sobeys, 7654 Tecumseh Rd. E., Windsor ON

Sobeys, 3714 Portage Rd., Niagara Falls ON

Littleneck clams

(sold July 3, 2013 to Aug. 6, 2013)

• Zehrs, 200 Franklin Blvd., Cambridge ON

Loblaw, 60 Carleton St., Toronto ON

Loblaw, 1740 Richmond St. N., London ON

Real Canadian Superstore, 1385 Harmony Rd. N., Oshawa ON

Real Canadian Superstore, 825 Don Mills Rd., Toronto ON

Real Canadian Superstore, 825 Oxford St. E., London ON

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Real Canadian Superstore, 1205 Oxford St., London ON

Sobeys, 125 The Queensway, Toronto ON

Blue point oysters or Atlantic oysters

(sold July 3, 2013 to Aug. 6, 2013)

Loblaw, 17 Leslie St., Toronto ON

Loblaw, 60 Carleton St., Toronto ON

Loblaw, 3671 Dundas St. W., Etobicoke ON

Loblaw, 5010 Glen Erin Dr., Mississauga ON

Loblaw, 10 Lower Jarvis St., Toronto, ON

Loblaw, 396 St. Clair Ave. W., Toronto ON

Blue point oysters

(Harvest sites CT-79, CT-105, CT-109 and CT-207 and harvest dates July 3, 2013 to Aug. 2, 2013)

Peter's Wholesale Meats, Ottawa ON.

Certain retailers in Quebec

Oysters

(sold from July 3, 2013 to Aug. 6, 2013)

Domenic's Fish Market, St. Lawrence Market, Toronto, ON