The outbreak has affected at least 106 people without a history of foreign travel since October 2012. The majority of the cases (68) have been reported from Denmark.
Epidemiological investigation identified frozen berries and strawberries as possible sources of the outbreak and purchase history investigations in Denmark indicated that frozen strawberries imported from North Africa are the most likely vehicle of infection. The distributor of the suspect fruit has now recalled it from the market.
The number of reported cases has declined in recent months, but ECDC points out that frozen strawberries could be kept for long periods by people who may be unaware of the problem.