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The skin evidenced red, non-scaly, oedematous papules coalescing into plaques with scattered non-follicular pustules. Skin biopsy was consistent with a neutrophilic dermatosis. The patient fulfilled the criteria for Sweet syndrome. A thorough evaluation ruled out alternative infectious, autoimmune or malignant aetiologies, and all manifestations resolved with glucocorticoids. While we cannot prove causality, there was a temporal correlation between the vaccination and the clinical findings.<\/jats:p>","DOI":"10.1136\/bcr-2021-243173","type":"journal-article","created":{"date-parts":[[2021,7,26]],"date-time":"2021-07-26T12:41:49Z","timestamp":1627303309000},"page":"e243173","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":50,"title":["Acute encephalitis, myoclonus and Sweet syndrome after mRNA-1273 vaccine"],"prefix":"10.1136","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0632-348X","authenticated-orcid":false,"given":"Gabriel","family":"Torrealba-Acosta","sequence":"first","affiliation":[{"name":"Neurology, Baylor College of Medicine, Houston, Texas, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jennifer C","family":"Martin","sequence":"additional","affiliation":[{"name":"Department of Dermatology, Baylor College of Medicine, Houston, Texas, 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