Who Is ‘Patient Zero’ in the 2019 Measles Outbreaks? By Vincent Iannelli, MD / May 29, 2019 / free-riders, hiding in the herd, measles outbreaks, MMR vaccine, patient zero, shedding, travel vaccines Who is the patient zero that started all of the 2019 measles outbreaks in the United States? Share this:FacebookTwitterRedditPrintLinkedInPinterestEmailTumblrWhatsAppLike this:Like Loading...