Almost all isolates (Listeria monocytogenes serotype 1/2a) belonged to cases living in southern Germany, indicating an outbreak with a so far unknown source. Case numbers in 2015 are high (n = 28). No outbreak cases outside Germany have been reported. Next generation sequencing revealed the unique cluster type CT1248 and confirmed the outbreak. Investigations into the source are ongoing.
Since November 2012, a previously not observed pulsed-field gel electrophoresis (PFGE) pattern in human isolates of invasive L. monocytogenes serotype 1/2a has been detected in Germany with increasing frequency. Altogether 66 outbreak cases have been recorded, with 28 cases in 2015. Four cases were pregnancy-associated and six cases died in the course of the disease. Here we provide details of the ongoing outbreak.
Ongoing outbreak of invasive Listeriosis, Germany, 2012 to 2015
Eurosurveillance, Volume 20, Issue 50, 17 December 2015
W Ruppitsch , R Prager, S Halbedel, P Hyden, A Pietzka, S Huhulescu, D Lohr, K Schönberger, E Aichinger, A Hauri, K Stark, S Vygen, E Tietze, F Allerberger, H Wilking