A cluster of invasive meningococcal disease in young men who have sex with men in Berlin, October 2012 to May 2013.

Between October 2012 and May 2013, five cases of invasive meningococcal disease in young men who have sex with men (MSM) living in Berlin were notified to local health authorities in Germany. Three of the five cases died. All were caused by serogroup C variants with the finetype P1.