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Potent pathogen-specific (tuberculosis; smallpox) and pathogen-agnostic (protection from diseases unrelated to the intentionally targeted pathogen) effects of BCG and smallpox vaccines hold significant translational potential. Yet despite their use for centuries, how scar formation occurs and how local skin-based events relate to systemic effects that allow these two vaccines to deliver powerful health promoting effects has not yet been determined. We review here what is known about the events occurring in the skin and place this knowledge in the context of the overall impact of these two vaccines on human health with a particular focus on maternal-child health.<\/jats:p>","DOI":"10.1007\/s00281-024-01022-9","type":"journal-article","created":{"date-parts":[[2024,8,26]],"date-time":"2024-08-26T15:02:06Z","timestamp":1724684526000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["The mark of success: The role of vaccine-induced skin scar formation for BCG and smallpox vaccine-associated clinical benefits"],"prefix":"10.1007","volume":"46","author":[{"given":"Ole","family":"B\u00e6k","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Frederik","family":"Schaltz-Buchholzer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anita","family":"Campbell","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nelly","family":"Amenyogbe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James","family":"Campbell","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter","family":"Aaby","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christine Stabell","family":"Benn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2403-9762","authenticated-orcid":false,"given":"Tobias R.","family":"Kollmann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,8,26]]},"reference":[{"key":"1022_CR1","first-page":"53","volume":"8","author":"S Luca","year":"2013","unstructured":"Luca S, Mihaescu T (2013) History of BCG Vaccine. 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