From 1 October 2012 until 5 July 2013, Denmark, Finland, Norway and Sweden reported 59 cases of hepatitis A (HAV). None of the patients had a travel history outside the EU before falling sick.
Overall, 103 HAV cases have been reported to be associated with this outbreak. The identification of closely-related HAV sequences in four different countries confirms that this is a multinational food-borne outbreak. The source has not been confirmed, but investigations in Denmark and Sweden point towards frozen strawberries as vehicle of infection. Food authorities in the affected Nordic countries have recommended boiling of frozen berries or berries of non-domestic origin before consumption.
ECDC Communicable Disease Threats Report
Art and Science of Laboratory Medicine
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