Risk factors for illness during a serogroup C meningococcal disease outbreak among men who have sex with men in New York City, New York, USA, in 2012-2013 included methamphetamine and cocaine use and sexually transmitted infections. Outbreak investigations should consider routinely capturing information regarding drug use and sex-related risk factors.
Keywords: Neisseria meningitidis; New York; New York City; bacteria; case–control study; disease outbreaks; homosexuality; invasive meningococcal disease; men who have sex with men; risk factors; serogroup C.