Pediatricians warn declining U.S. childhood vaccination rates could trigger outbreaks
CDC data shows kindergarten immunization rates have fallen below herd-immunity levels for measles, prompting doctors to caution that lower coverage may lead to increased cases of preventable diseases.
Vaccination coverage among U.S. kindergarteners has slipped to 92.4% for measles and 92% for diphtheria, tetanus and pertussis, according to the Centers for Disease Control and Prevention, down from about 95% in the 2019-20 school year. Pediatric specialists say the decline puts many communities below the 95% herd-immunity threshold needed to prevent measles outbreaks.
"When we fall below 95% in a community, we fall below the herd immunity protective level," said Dr. Alok Patel, a pediatric hospitalist at Stanford Children’s Health.
Patel noted that the national average masks considerable variation, with some counties reporting coverage in the mid-70s percent. He and other clinicians warned that reduced immunization could allow measles, which is highly contagious, to re-emerge and could also facilitate increases in other vaccine-preventable illnesses such as pertussis, tetanus, hepatitis B and, potentially, mumps and rubella.
"Measles is almost a smoke detector of a potential fire of a rise in preventable illnesses," Patel added.
Dr. Melissa Stockwell, division chief of child and adolescent health at Columbia University, said restoring lost coverage can be a slow process because it requires both catching up unvaccinated children and rebuilding public trust in health authorities.
"Vaccination rates can fall very quickly, but they can take quite a long time to recover," Stockwell explained.
Pediatric critical-care physician Dr. Anita Patel highlighted the long-term health impacts on children who contract vaccine-preventable diseases, including severe complications from hospitalization and chronic conditions that may persist for life.
"When children get an illness and are hospitalized, the complications can stay with them for the rest of their lives," she said.
The doctors emphasized that lower vaccination rates disproportionately affect vulnerable populations with limited access to health care, and that many clinicians have limited experience treating diseases that have become rare in the United States.
"Most doctors and nurses aren’t used to treating vaccine-preventable illnesses because these diseases have not been common here for decades," Anita Patel noted.
Public health officials continue to monitor the situation, urging parents to follow recommended immunization schedules to protect individual children and the broader community.