Resurgence of Measles in Post-pandemic Era: A Call for Strengthened Routine Immunization Systems

Dear Editor, The global decline in measles vaccination coverage during the Coronavirus disease 2019 pandemic has set the stage for a dangerous resurgence of the disease, with outbreaks now being reported in multiple regions previously declared measles-free.1 In the first quarter of 2025, the World Health Organization documented a 45% increase in measles cases compared to the same period in 2024, with significant outbreaks occurring in Europe, the Americas, and the Western Pacific.1 This alarming trend underscores a critical backslide in one of public health’s most preventable diseases, driven largely by disruptions in routine immunization services and growing vaccine hesitancy.2 Measles, a highly contagious viral illness, requires at least 95% population immunity through vaccination to prevent community transmission. However, pandemic-related healthcare interruptions led to an estimated 25 million children missing their first measles vaccine dose in 2024 alone.2 Compounding this, misinformation regarding vaccine safety continues to erode public confidence, particularly in communities with limited access to trusted health information.3 The consequences are severe: measles-related hospitalizations have risen by nearly 60% in affected regions, straining healthcare systems already recovering from the pandemic.1 The public health implications extend far beyond acute illness. Measles infection induces immune amnesia, leaving survivors vulnerable to other infectious diseases for months to years.4 Furthermore, outbreaks in densely populated urban areas or during mass gatherings—such as religious events or international conferences—pose risks of rapid international spread. Recent genomic surveillance has identified multiple imported measles strains in countries without endemic transmission, highlighting the fragility of elimination achievements and the need for vigilant global surveillance.5 From a preventive medicine perspective, urgent action is required at multiple levels. First, catch-up vaccination campaigns must be prioritized, targeting children and adolescents who missed routine doses during the pandemic.2 Second, healthcare workers and community leaders should be engaged in countering misinformation through culturally sensitive communication strategies.3 Third, digital immunization registries should be expanded to improve tracking and outreach. Finally, international collaboration must be strengthened to ensure a rapid response to cross-border outbreaks, including the sharing of genomic and epidemiological data.5 The resurgence of measles is a warning sign of weakened immunization systems worldwide. Restoring and sustaining high vaccination coverage is not only essential to prevent measles-related morbidity and mortality but also to protect the broader gains of global immunization programs. Acknowledgment None. Financial support and sponsorship Nil. Conflicts of interest There are no conflicts of interest.