Announcement 10 February 2026: - The deadline of the RFP was extended from 16 February 2026 23:59 hours (GMT+1) time to 23 February 2026 23:59 hours (GMT+1) time - Second set of Q&A document is now available under "Documents" tab.   Announcement 21 January 2026: First set of Q&A document is now available under "Documents" tab.   The purpose of this Request for Proposals is to identify a suitable contractor to conduct mathematical modeling that will inform a framework to adapt WHO guidance for empiric antimicrobial prescribing for common infections to local contexts. The modeling should explore the use of both individual and population-level microbiological and clinical data to guide empiric antibiotic decisions, aiming to improve patient outcomes while also limiting the use of antibiotics with unnecessarily broad spectrum and ultimately antimicrobial resistance. The modelling framework should be broadly applicable to infections included in the WHO AWaRe antibiotic book but must include enteric fever and neonatal sepsis as case studies.  See detailed Terms of Reference and bidding instructions under “Documents” below.  Please note: it is NOT necessary to click on “Express Interest” on the top right-hand side of the screen. In order to inform WHO that you are interested in participating in this Request for Proposals, please follow the provisions of the RFP document below.