Abstract

Abstract Background In immunization, vaccine consumption typically exceeds the number of recipients. The number of doses per vial influences wastage and vaccination coverage goals. In Brazil, 48% of the National Immunization Program’s vaccines are multidose, with 4 having limited shelf-life post-opening. Strategies to reduce wastage aim to optimize dose utilization, enhance process quality, and broaden coverage effectiveness. The objective was to outline strategies for reducing wastage and expanding coverage for children under 5 in 14 São Paulo city Primary Health Care Units (PHCUs). Methods The Lean Six Sigma approach guided the stages. A group conducted contextual analysis to identify PHCU barriers. Data on wasted doses and vaccination were gathered. Weekly meetings for data analysis began in May 2023, following DMAIC phases: Define, Measure, Analyze, Improve, Control. An action plan stemmed from these phases for PHCU implementation. Results Data analysis, from January 2022 to June 2023, revealed a significant vaccine wastage trend, reaching 59% from January to December 2022 and increasing to 63% from January to June 2023. This wastage incurs an average annual cost of R$614,416.26, due to lost doses from expiration after vial opening and expiration of shelf life. The vaccines analyzed were BCG, Oral Polio Vaccine (OPV), Measles, Mumps, and Rubella (MMR), and Yellow Fever. At the project start in May 2023, vaccination coverage was 90%, increasing to 93% afterward. This rise resulted from actions taken and improved data monitoring. Post-project, vaccine wastage reduced by 7 percentage points (from 62% to 56%). Conclusions Addressing vaccine wastage and expanding vaccination coverage for children under 5 are critical in healthcare. Utilizing Lean Six Sigma, key issues in PHCUs were identified, leading to an action plan that reduced wastage, increased coverage, and standardized processes. Key messages • Vaccines are valuable resources and wasting them means reducing financial resources in health. • Vaccination coverage is crucial to protect the population’s health, prevent disease outbreaks, and maintain the country’s economic health, reducing costs for treating preventable diseases.

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