The European Centre for Disease Prevention and Control (ECDC) and the European Food Safety Authority (EFSA) have warned of the possibility of more cases being identified in the multi-country outbreak of invasive Listeria monocytogenes serogroup IVb multi-locus sequence type 6.
Frozen corn and potentially other frozen vegetables produced in a company in Hungary have been described as the likely source of the outbreak which has affected patients in Austria, Denmark, Finland, Sweden and the United Kingdom. As of 15 June 2018, 47 cases including nine deaths had been reported.
The immediate withdrawal and recall of all frozen vegetable products produced by the plant between August 2016 and June 2018 has been ordered.
In a joint rapid risk assessment the ECDC and EFSA said despite the recall, new cases may still be identified due to the long incubation period of up to 70 days, the long shelf-life of frozen corn products, and potential consumption of frozen vegetable products bought by consumers before the recalls and eaten without being properly cooked.
Competent authorities are being asked to report new human cases associated with this event to the Epidemic Intelligence Information System for Food- and Waterborne-Diseases and Zoonoses (EPIS-FWD).