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In Malawi, delivery of ICT has faced challenges due to limited technical capacity of healthcare workers (HCWs) and clinical coordination. Digitisation of training and quality improvement processes presents an opportunity to address these challenges. We developed an implementation package that combines digital and face-to-face modalities (blended learning) to strengthen HCWs ICT skills and enhance quality improvement mechanisms. This cluster randomised controlled trial will assess the impact of the blended learning implementation package compared with the standard of care (SOC) on implementation, effectiveness and cost-effectiveness outcomes.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods and analysis<\/jats:title><jats:p>The study was conducted in 33 clusters in Machinga and Balaka districts, in Southern Malawi from November 2021 to November 2023. Clusters are randomised in a 2:1 ratio to the SOC versus blended learning implementation package. The SOC is composed of: brief face-to-face HCW ICT training and routine face-to-face facility mentorship for HCWs. The blended learning implementation package consists of blended teaching, role-modelling, practising, and providing feedback, and blended quality improvement processes. The primary implementation outcome is HCW fidelity to ICT over 1 year of follow-up. Primary service uptake outcomes include (a) index clients who participate in ICT, (b) contacts elicited, (c) HIV self-test kits provided for secondary distribution, (d) contacts tested and (e) contacts identified as HIV-positive. Service uptake analyses will use a negative binomial mixed-effects model to account for repeated measures within each cluster. Cost-effectiveness will be assessed through incremental cost-effectiveness ratios examining the incremental cost of each person tested.<\/jats:p><\/jats:sec><jats:sec><jats:title>Ethics and dissemination<\/jats:title><jats:p>The Malawi National Health Science Research Committee, the University of North Carolina and the Baylor College of Medicine Institutional Review Boards approved the trial. Study findings will be disseminated through peer-reviewed journals and conference presentations.<\/jats:p><\/jats:sec><jats:sec><jats:title>Trial registration number<\/jats:title><jats:p><jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"clintrialgov\" xlink:href=\"NCT05343390\">NCT05343390<\/jats:ext-link>.<\/jats:p><\/jats:sec>","DOI":"10.1136\/bmjopen-2023-077706","type":"journal-article","created":{"date-parts":[[2024,1,22]],"date-time":"2024-01-22T18:10:58Z","timestamp":1705947058000},"page":"e077706","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":10,"title":["Does a blended learning implementation package enhance HIV index case testing in Malawi? 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