The Massachusetts Department of Public Health is investigating a suspected case of hepatitis A in a food service worker at Tasty Burger's North Station location.
A health department spokesman said the agency is working with the Boston Public Health Commission and Boston Inspectional Services. They said they are not aware of any other cases linked to the restaurant.
The risk to the public has been determined to be low, the health department spokesman said.
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Tasty Burger issued a statement Friday calling the case "an isolated incident with one employee at one Tasty Burger location in Boston." They said they are following the health commission's recommendations, and that all Tasty Burger locations remain open.
The hepatitis A virus is spread as a result of fecal contamination and may be spread from person to person through close contact or through food handling. The virus can be spread by contaminated food and beverages.
The early signs and symptoms of hepatitis A are fever, fatigue, loss of appetite, nausea, vomiting, diarrhea, and jaundice. The illness varies in severity, with mild cases lasting two weeks or less and more severe cases lasting four to six weeks or longer.