US Vaccine Confidence Declines Amid Measles and Flu Outbreaks
A new survey from the University of Pennsylvania's Annenberg Public Policy Center has revealed a concerning decline in the percentage of Americans who view vaccines for measles, flu, and Covid as safe. The findings come during a historic year for measles and flu, including the largest measles outbreak in the United States since 2000, raising alarms among public health experts.
Survey Shows Significant Drops in Perceived Safety
The winter 2025 survey, which polled more than 1,600 U.S. adults, found small but statistically significant decreases in vaccine confidence compared to a similar survey conducted in 2024. Specifically, the perceived safety of the measles-mumps-rubella (MMR) vaccine has fallen by three percent, with only 83 percent of respondents now believing it is safe. This vaccine provides 97 percent protection against life-threatening measles after two doses, making the decline particularly troubling.
Similarly, the proportion of people who view the seasonal flu vaccine as safe has dropped from 83 percent in 2024 to 80 percent in 2025. While there was no significant change for the Covid vaccine between 2024 and 2025, confidence has plummeted since 2022, falling from 73 percent to 65 percent. Researchers note that these shifts occur despite most Americans still regarding the vaccines as safe overall.
Potential Causes Behind the Decline
The reasons for this erosion in trust remain unclear, according to the study's authors. Research analyst Laura Gibson expressed concern, stating, "While most people continue to regard the flu and MMR vaccines as safe, it is concerning that we are seeing a decline in perceptions of safety over time." She added that it is uncertain whether changes in CDC recommendations during 2025 are influencing perceptions or if the decline is a continuation of trends observed from 2022 to 2024.
The report cites "unsupported or misleading" claims about vaccines made by Health and Human Services Secretary Robert F. Kennedy, Jr., as well as federal health officials' "variety of seemingly contradictory positions on vaccines" that could undermine public trust. Kennedy, a known vaccine skeptic, has questioned vaccine safety and promoted unproven measles treatments, with critics like Dr. Céline Gounder of NYU Langone Health accusing him of misrepresenting science.
Impact on Public Health and Outbreaks
Vaccine hesitancy in America was rising even before the Covid pandemic, but misinformation spread rapidly on social media has exacerbated the issue. This hesitancy is now linked to surges in measles, flu, and other illnesses that have resulted in deaths, particularly among the young and elderly. Dr. Paul Offit, a professor of vaccinology at the University of Pennsylvania, lamented last year during the deadliest flu season for children since 2004, "Our children are suffering needlessly."
This year, the threat persists with flu levels elevated to their highest in decades and the U.S. experiencing its largest measles outbreak since 2000 in South Carolina. While no measles deaths have been reported this year, flu has caused 12,000 deaths, including 60 children, and Covid continues to lead to hundreds of deaths weekly. Experts emphasize that vaccination is the best way to prevent severe infections in all cases.
Worrisome Thresholds and Community Immunity
Kathleen Hall Jamieson, director of the Annenberg Public Policy Center, highlighted a critical concern: "Although a strong majority of Americans view the measles vaccine as safe relative to other vaccines, the fact that the number holding that view is below the 95 percent threshold required to achieve community immunity is worrisome." This drop below the herd immunity level increases the risk of further outbreaks and public health crises.
The Department of Health and Human Services did not immediately respond to requests for comment on these matters, leaving questions about policy impacts unanswered. As vaccine confidence wanes, the ongoing outbreaks underscore the urgent need for clear communication and evidence-based public health strategies to restore trust and protect communities.
