Shellfish could be contaminated with norovirus or hepatitis.
Shellfish harvesting is halted in some Virginia portions of the Chesapeake Bay due to health concerns related to flooding from last week's superstorm.
The temporary ban went into effect yesterday morning and will likely run through next weekend. It affects Lynnhaven Bay, and the James, Poquoson and Back rivers.
State health officials say they are concerned that the norovirus and the hepatitis virus could have entered urban rivers from sewage bypasses.
Last week, the Virginia Department of Health closed all of the state's portions of the bay to shellfish harvesting due to flooding resulting from Hurricane Sandy. The department lifted the overall ban on Saturday.