The American Medical Association is sounding the alarm: declining MMR vaccination rates are fueling preventable outbreaks across the U.S.

Measles has claimed two lives in Pennsylvania — the state’s first measles deaths in 35 years — and both individuals were unvaccinated.

The AMA emphasized that these deaths — both in Lancaster County and among unvaccinated individuals — are a stark reminder that measles remains highly contagious, severe, and entirely preventable. The association underscored three key points:

• Measles is resurging nationally, with U.S. cases already surpassing last year’s total.

• Every confirmed case in Pennsylvania has occurred in someone not fully vaccinated, according to state officials.

• Declining MMR vaccination rates are leaving communities vulnerable, with kindergarten coverage dropping to 92.4%, below the 95% threshold needed for community protection.

AMA aligned infectious disease experts quoted in coverage stressed that measles deaths are “nearly 100% preventable” with routine vaccination and urged families to speak with clinicians and get vaccinated immediately.

The CDC continues to recommend two doses of the MMR vaccine, which provides up to 97% protection against measles. Every confirmed case in Pennsylvania’s growing outbreak has occurred in someone not fully vaccinated, underscoring the urgency of restoring community immunity.

Current Vaccine Recommendation (CDC/AMA aligned)

• Two doses of the MMR vaccine remain the standard:

o 1st dose: 12–15 months

o 2nd dose: 4–6 years

• Effectiveness:

o One dose: 93% protection

o Two doses: 97% protection

• AMA and CDC experts reiterate that the MMR vaccine is safe, widely available, and the strongest tool to stop ongoing outbreaks.

For diagnostics manufacturers, labs, and health system leaders, this resurgence highlights the critical need for robust surveillance, rapid testing capacity, and clear public health communication. GRN IVD Consulting will continue to track measles epidemiology and its implications for infectious disease testing markets.