As the United States confronts a resurgence of measles, a disease that vaccination had brought under substantial control, a fundamental question is returning to public debate: Do vaccines really work, and why are preventable diseases reappearing?<\/p>\n
On Tuesday, October 27, the University of Pennsylvania will put that question at the center of a public discussion examining the history, scientific advances, and future of vaccination in the United States. The event, titled From Measles to mRNA: American Efforts to Advance Vaccines and Public Health, will take place from 5 to 6 p.m. at Perry World House in Philadelphia, with online participation also available. The event is part of the university\u2019s commemoration of America\u2019s 250th anniversary and will examine vaccine innovation, public trust, and preparedness for future pandemics. The university has also announced a free influenza vaccination clinic before and after the discussion.<\/p>\n
The timing is significant. According to the Centers for Disease Control and Prevention (CDC), 4,588 confirmed measles cases had been reported across the United States as of October 22, 2026, spanning 47 jurisdictions. That figure represents a substantial increase from the 2,289 cases recorded throughout 2025. The CDC also reported that 96% of confirmed cases in 2026 were associated with outbreaks. These figures are preliminary and may change as additional cases are confirmed.<\/p>\n
The numbers illustrate a central challenge for public health: the existence of an effective vaccine does not guarantee that a population will remain protected. Immunization depends not only on scientific advances but also on access to healthcare services, sustained vaccination coverage, reliable information, and public confidence.<\/p>\n
What the Scientific Evidence Shows<\/p>\n
The scientific evidence provides a clear starting point. Vaccines train the immune system to recognize and respond to infectious agents, reducing the likelihood of contracting diseases and, in many cases, developing serious complications. Their effectiveness varies by vaccine and disease, but decades of research have established vaccination as one of the most important tools in preventive medicine.<\/p>\n
The measles, mumps, and rubella vaccine, commonly known as MMR, offers a particularly compelling example. According to the CDC, one dose is approximately 93% effective against measles, while two doses provide about 97% protection. The recommended childhood schedule calls for the first dose between 12 and 15 months of age and the second between ages 4 and 6. Most people who receive the recommended doses remain protected against measles for life.<\/p>\n
No vaccine is perfect. Some vaccinated people may still become infected, and immune responses can vary from one individual to another. However, infections among vaccinated people do not invalidate the evidence supporting immunization. Assessments must consider the likelihood of infection, the risk of severe illness, and the potential for transmission. For certain diseases, vaccinated people who become infected may also experience milder illness than those who are unprotected.<\/p>\n
Measles demonstrates why these distinctions matter. The virus spreads through the air and is exceptionally contagious. It can cause pneumonia, brain inflammation, severe dehydration, and other complications, particularly in young children and people with weakened immune systems. Before widespread vaccination, major epidemics occurred every two to three years, causing an estimated 2.6 million deaths annually worldwide, according to the World Health Organization.<\/p>\n
The WHO estimates that measles vaccination prevented nearly 59 million deaths between 2000 and 2024. This achievement represents far more than a statistical milestone: it demonstrates how preventive medicine can transform the course of a disease across generations.<\/p>\n
When Public Confidence Becomes a Public Health Issue<\/p>\n
Despite these advances, vaccination coverage in the United States has weakened. CDC data show that MMR vaccination coverage among children entering kindergarten declined from 95.2% during the 2019\u20132020 school year to 92.4% in 2025\u20132026. The agency estimates that approximately 280,000 kindergarteners were at risk during the latter school year because of gaps in vaccination coverage.<\/p>\n
The decline matters because measles can spread rapidly when it reaches communities with insufficient immunity. The CDC states that vaccination coverage above 95% helps protect communities through population immunity, although local rates can differ considerably from national averages.<\/p>\n
Vaccine skepticism, misinformation, practical barriers to healthcare, and inequalities in access to medical services can all complicate immunization efforts. These factors, however, should not be treated as interchangeable. A parent who cannot secure a medical appointment faces a different problem from someone who has encountered misleading claims online. Effective public health communication must distinguish between the two.<\/p>\n
Building trust requires more than repeating official recommendations. Healthcare professionals must explain the scientific evidence, acknowledge that vaccines can cause side effects, distinguish common mild reactions from rare serious adverse events, and ensure that reliable information is accessible. The CDC states that MMR vaccines have a strong safety record and that extensive research has found no link between MMR vaccination and autism.<\/p>\n
For communities navigating conflicting information, including Spanish-speaking families who encounter health content across multiple languages and media platforms, access to clear explanations from trusted medical professionals can be particularly important.<\/p>\n
Philadelphia\u2019s Role in the Future of Immunization<\/p>\n
The University of Pennsylvania forum will feature Nicole Lurie, executive director for preparedness and response at the Coalition for Epidemic Preparedness Innovations (CEPI), and Paul Offit, director of the Vaccine Education Center at Children\u2019s Hospital of Philadelphia (CHOP) and a professor of vaccinology at Penn\u2019s Perelman School of Medicine. The discussion will be moderated by Maiken Scott, a health and science journalist at WHYY, with introductory remarks from university vice provost Ezekiel Emanuel.<\/p>\n
The event comes as researchers continue building on decades of innovation, from vaccines against measles and rubella to rotavirus vaccines and the messenger RNA technology used in COVID-19 vaccines. These advances have expanded the possibilities for disease prevention, but scientific innovation alone cannot guarantee that discoveries will translate into widespread protection across the population.<\/p>\n
Ultimately, the question is not whether vaccines eliminate every risk. It is whether the evidence demonstrates that they reduce disease and save lives, and whether healthcare systems can distribute them equitably while earning the public\u2019s trust. In the case of measles, the available evidence is compelling: vaccination is highly effective, and declining coverage creates conditions in which outbreaks can return.<\/p>\n
As Philadelphia\u2019s scientific and public health communities gather on October 27, the challenge will be to connect that evidence with the concerns people bring to the discussion. Preventing the next outbreak will require not only effective vaccines, but also transparent communication, accessible healthcare, and a sustained commitment to public trust.
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