This year’s measles outbreak in North America has seen around 1,000 cases in the U.S., raising alarm about possible herd immunity decline. Experts in infectious diseases have been sounding the alarm.
Dr. Paul Offit from the Center for Vaccine Education at Philadelphia Children’s Hospital noted that while measles was declared eliminated in the U.S. back in 2000 due to high vaccination rates, the current situation suggests we may have slipped into what he calls a “post-immunity” phase.
“I think the occurrence of measles demonstrates this,” Offit remarked.
He added, “Measles is the most contagious human disease preventable by vaccination, so it’s the first to re-emerge when protection dwindles.”
The U.S. is finding it challenging to sustain the 95% vaccination rate needed for herd immunity, especially with the rising anti-vaccine sentiment. Current estimates suggest only about 91% of Americans are vaccinated, leaving a significant gap. The National Infectious Diseases Foundation has pointed this out.
Offit expressed concern that the loss of immunity seen with measles might eventually extend to other infectious diseases.
According to the Centers for Disease Control and Prevention, the latest update showed cases have risen to 935. There have been at least 2,500 confirmed cases across the U.S., Canada, and Mexico, with the outbreak showing no signs of abating.
Texas is currently the epicenter, with 683 confirmed cases since late January, including 20 new ones just last week.
Tragically, three deaths have occurred in the U.S.: two unvaccinated elementary school students (their underlying health conditions are unknown) and an unvaccinated adult in New Mexico.
Officials noted that the measles strains circulating in Canada, which seem to have originated in the fall, align with other significant outbreaks seen in the U.S. and Mexico.
Data from the CDC shows that a staggering 96% of those infected this year were not vaccinated.
This year’s case count has tripled compared to 2024, which logged only 285 cases.
Additionally, 13% of measles patients required hospitalization, up from 11% the previous week, highlighting a growing concern.
Measles is among the most infectious diseases globally and can result in serious complications, including pneumonia, blindness, brain swelling, and even death.
Before the vaccine was introduced, the CDC reported that each year, about 400-500 individuals died from measles, 48,000 were hospitalized, and 1,000 encountered brain swelling in the U.S.
In another vein, Robert F. Kennedy Jr., director of Health and Human Services, recently commented that the media should focus more on diabetes and autism, which he sees as “existential threats” to the nation’s health, rather than on measles.
