Cases have been on the rise, and some adults may not be fully protected. Here’s what to know about who needs the MMR vaccine, why immunity can fade, and how to stay covered. Tap the link in bio for more. #webmd #measles #MMRvaccine #immunizationawareness #publichealth #preventdisease #healthtips #consumerhealth #infectiousdisease #mmr #measlesoutbreak