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2. European Centre for Disease Prevention and Control . Multi‐country outbreak of Listeria monocytogenes PCR serogroup IVb MLST ST6 – 6 December 2017. Stockholm: ECDC; 2017.
3. Centers for Disease Control and Prevention (CDC) . Listeria (Listeriosis) Atlanta (USA): CDC; 2017. Available from: https://www.cdc.gov/listeria/index.html.
4. European Centre for Diseases Prevention and Control (ECDC) . Facts about listeriosis Stockholm: ECDC; 2017. Available from: https://ecdc.europa.eu/en/listeriosis/facts.