One Pathogen Leads Everywhere: Country Profiles of Pathogen-Attributable Childhood Lower-Respiratory-Infection Deaths in 204 Countries, 2023

Objective To describe, for every country, pathogen-attributable fractions (PAFs) of childhood (0–19 years) lower respiratory infection (LRI) deaths in 2023, and to classify countries by etiologic composition for vaccine, treatment and hospital policy.Methods We analysed the Global Burden of Disease Study (GBD) 2023 etiology module: PAFs for 26 pathogens, 204 countries and four childhood age groups. Country PAFs for ages 0–19 years were computed as deaths-weighted averages. We derived a five-type typology by k-means clustering, quantified a hospital-associated pathogen group, and cross-tabulated profiles against pneumococcal conjugate vaccine (PCV) policy, death burden and age.Findings Streptococcus pneumoniae was the largest single contributor in all 204 countries (PAF 13.1%–51.5%; median 26.4%); nineteen countries exceeded 40%. Five composition types traced a gradient from pneumococcus hyper-dominance to diversified high-income profiles; Klebsiella pneumoniae ranked second in 125 countries and Staphylococcus aureus in 75. The hospital-associated group accounted for 19.1%–33.8% of deaths in every country (mean 27.6%), without high-income exemption. Intersecting PAF above 40% with the 20 highest-burden countries isolated Indonesia, Chad and, borderline, Somalia as priority cells (threshold-sensitive; Text S8); India, Nigeria and the Democratic Republic of the Congo formed the volume core. All 19 high-PAF countries completed nationwide PCV introduction only from 2021, or lacked a universal programme by end-2023.Conclusion One pathogen leads childhood LRI mortality everywhere, but with a four-fold gradient; country PAF profiles are a direct, reproducible input for prioritizing PCV completion, hospital-platform interventions and age-stratified strategies.