Is January Usually a Big Measles Month? By Vincent Iannelli, MD / January 30, 2019 / early MMR, endemic, measles month, measles outbreaks, measles seasons, measles year, MMR, post-vaccine era, pre-vaccine era With 86 cases of measles already, this is second highest number of measles cases in January since 1991. Share this:FacebookTwitterRedditPrintLinkedInPinterestEmailTumblrWhatsAppLike this:Like Loading...