Truveta’s research team said its analysis suggests that public awareness of high-profile local measles outbreaks might be influencing more people across the country to seek the immunity tests, which are called titer tests. During 2025 — as a major measles outbreak was underway in West Texas — more than 62,000 older adults across the country went to doctors’ offices to get measles titer tests, the Truveta analysis found. Nationwide, adults 50 and older received measles immunity testing last year at nearly seven times the rate they had in recent years. Protecting her newborn grandbabies was Nancy Churnin’s motivation in getting a measles titer test last year before they were born. But the CDC guidance also says they can get a measles titer test to determine if they need the vaccine.