Navigating Pakistan's immunization landscape: Progress and pitfalls.

Objectives: This study aims to assess the impact of the 2022 floods in Pakistan on the incidence of vaccine-preventable diseases (VPDs) in flood-affected regions, specifically focusing on areas with traditionally low vaccination coverage. Design: Weekly incidence data of VPDs from September to November 2021 and 2022 were collected and analyzed for the provinces of Sindh, Khyber Pakhtunkhwa, and Baluchistan. The study compared year-on-year changes in disease incidence to evaluate the effect of the floods on disease burden. Results: The analysis revealed significant increases in the incidence of various VPDs in the flood-affected regions compared to the previous year. Diseases such as pertussis showed a 171% increase, while mumps exhibited nearly a 1000% increase in reported cases. Other diseases including polio, diphtheria, neonatal tetanus, measles, chickenpox, and rubella also experienced substantial rises in case numbers. Concurrently, cases of lower respiratory tract illnesses and diarrheal diseases in children under five years old surged notably. Conclusions: The findings underscored the failure of relief and healthcare efforts in managing vaccine-preventable diseases in flood-affected areas of Pakistan. The study highlights an urgent need for targeted intervention strategies, including enhanced immunization drives and healthcare infrastructure improvements in vulnerable regions. The post-flood scenario presents a critical opportunity to address existing challenges in vaccination coverage and to mitigate future disease outbreaks through comprehensive public health initiatives.