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News
As measles outbreaks grow more frequent across the U.S., families of children with complex medical conditions are facing impossible choices. Declining vaccination rates are eroding herd immunity, leaving vulnerable kids — who can't always mount a full immune response — dangerously exposed. For these families, a "mild" illness can mean weeks in the hospital or worse.
As measles outbreaks surge across the U.S. — including a major ongoing outbreak in Pennsylvania with at least 731 cases and four deaths — families of medically complex children are sounding the alarm. Kids with rare genetic disorders, heart conditions, or compromised immune systems face far greater risks from vaccine-preventable diseases than their peers. For these families, the calculus around something as routine as attending school or a dance class has become fraught with anxiety.
The root of the problem: falling vaccination rates. The CDC reports that only 92.4% of kindergarteners received the MMR vaccine in the 2025–26 school year — well below the 95% threshold needed for herd immunity. Vaccine exemptions also rose from 3.6% to 4.2%. When herd immunity breaks down, the most vulnerable children — those who may not respond fully to vaccines or who have weakened immune systems — lose their last line of defense.
By the Numbers:
Why it matters: For medically fragile children, herd immunity isn't just a public health concept — it's a lifeline. As more families opt out of vaccines, the ripple effects fall hardest on kids who are already fighting the toughest battles.
