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Health & Wellness
Diseases & Conditions

Cryptosporidium has been found in oysters harvested from the Chesapeake Bay

Cryptosporidium, a parasite that causes diarrhea, can be added to the list of reasons not to eat raw oysters, according to an article in an upcoming issue of CDC's Emerging Infectious Diseases journal.

Oysters feed by filtering water through their gills. When water is contaminated by run-off from pastures or sewage, oysters can keep the parasite in their gills and spread illness. Researchers tested oysters from seven sites used for commercial harvesting in the Chesapeake Bay area. Oysters from all the sites contained Cryptosporidium species both from cows and people. This finding shows that the water at these sites contained human and animal feces during a period when the oysters were filtering. The risk of contamination is probably higher after a heavy rain, but some risk is present year-round.

Infection with Cryptosporidiumm can cause prolonged diarrhea. The infection is especially dangerous for persons with weakened immune systems. However, heating to temperatures above 162� F kills the parasite, so the authors urge that oysters be cooked before they're eaten.

Access the full article at http://www.cdc.gov/ncidod/EID/vol5no5/fayer.htm.

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U.S. DEPARTMENT OF HEALTH AND HUMAN SERVICES

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Subramanian Malaisamy MD, MRCP (UK), FCCP (USA) picture
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Subramanian Malaisamy MD, MRCP (UK), FCCP (USA)

Associate Chief Medical Officer, Medical Editorial Board, DoveMed Team

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