A new report from the World Health Organization (WHO) and UNICEF brings a mix of good news and a serious warning for public health in the Americas. While routine childhood immunizations have largely bounced back from pandemic-related disruptions, a concerning drop in measles vaccination rates is creating significant risks for communities across the region. The 2025 WHO and UNICEF Estimates of National Immunization Coverage (WUENIC) reveal important progress: the number of children under one year old who missed out on their essential vaccinations decreased from 1.3 million to 1.1 million. This positive trend underscores the dedication of health systems and communities to catch up on vital health services. ## Significant Recovery in Routine Immunization The report highlights a strong recovery in core vaccination programs. Coverage for the first dose of the diphtheria, tetanus, and pertussis (whooping cough) vaccine, known as DTP1, reached an impressive 92%. The third dose, DTP3, held steady at 86%. These figures are particularly encouraging because they not only signify a full recovery from the setbacks faced during the COVID-19 pandemic but actually surpass pre-pandemic immunization levels for these crucial vaccines. Dr. Jarbas Barbosa, Director of the Pan American Health Organization (PAHO), lauded these achievements, noting that they demonstrate the region’s capacity for progress. He emphasized the region’s global leadership in areas like HPV vaccination, yet also cautioned against complacency, pointing to the resurgence of measles as a stark reminder of ongoing challenges. Diphtheria, tetanus, and pertussis are serious diseases; diphtheria can cause breathing problems and heart damage, tetanus leads to painful muscle spasms, and pertussis (whooping cough) is highly contagious and especially dangerous for infants. High vaccination rates for these diseases protect both individuals and the wider community. ## The Lingering Threat of Measles Outbreaks Despite the overall positive trend in routine immunizations, measles vaccination coverage presents a worrying picture. After a slight increase in 2024, coverage for the first dose of the measles-containing vaccine (MCV1) slipped from 89% to 88% in 2025. Similarly, coverage for the second dose (MCV2) dropped from 79% to 78%. Both these figures fall significantly short of the 95% threshold required to establish ‘herd immunity’ – the critical level of community protection needed to prevent widespread outbreaks of this extremely contagious disease. Measles is one of the most infectious diseases known, meaning it spreads very easily among unvaccinated people. Just one infected person can quickly transmit the virus to many others in a non-immune population. Symptoms typically include fever, cough, runny nose, red eyes, and a characteristic rash. While often seen as a childhood illness, measles can lead to severe complications such as pneumonia, brain inflammation (encephalitis), and even death, especially in young children and immunocompromised individuals. The decline in vaccination rates leaves small pockets of unvaccinated individuals vulnerable, allowing the virus to find fertile ground and rapidly ignite outbreaks. ## Addressing Uneven Coverage and Inequalities The WUENIC estimates also reveal significant disparities in measles vaccination rates, not only between different countries but also within them. While some nations consistently achieve coverage above 90%, others lag considerably behind. These inequalities often mirror broader geographic and socio-economic challenges, where access to healthcare services, including immunization, is uneven. Factors such as remote living, poverty, migration, and even vaccine misinformation can contribute to these gaps. Countries across the region are currently grappling with measles outbreaks, predominantly affecting individuals who have either not been vaccinated or have not completed their recommended doses. These incidents serve as powerful reminders of how quickly measles can re-emerge when immunity levels drop, underscoring the urgent need for ongoing investment in robust vaccination programs, strong disease surveillance, and swift responses to contain outbreaks. ## The Americas Lead in HPV Vaccination Amid these challenges, the Americas stand out as a global leader in human papillomavirus (HPV) vaccination. In 2025, coverage reached an impressive 71%. This success reflects sustained political commitment and investment aimed at protecting adolescents from cervical cancer, which is the second leading cause of cancer deaths among women in many parts of the region. HPV vaccination is a crucial tool in preventing specific types of cancer, demonstrating how targeted immunization efforts can yield significant public health dividends over the long term. This achievement proves that when countries prioritize access to vaccines and build comprehensive programs, they can protect people across their lifespan. ## Sustaining Progress Requires Continuous Investment While the recovery of routine immunization in the Americas is a significant public health milestone, the latest data make it clear that the work is far from over. The persistent gaps in immunity, particularly against measles, continue to leave communities vulnerable to vaccine-preventable diseases and threaten to undo decades of hard-won progress. To address this, organizations like PAHO are actively collaborating with countries to bolster national immunization programs. Their efforts focus on reaching children who have missed their routine shots, building public confidence in vaccines through clear, evidence-based communication, and strengthening disease surveillance and outbreak response systems. Furthermore, PAHO’s Revolving Fund plays a critical role in helping countries access high-quality, affordable vaccines in a timely manner, directly supporting their efforts to enhance coverage and close existing immunity gaps. Maintaining high vaccination coverage in every community is essential not only to prevent future outbreaks but also to safeguard the health improvements achieved across the Americas. Ensuring that every child receives the life-saving protection vaccines offer is a collective responsibility that demands sustained effort and investment from governments, healthcare providers, and communities alike.