PT - JOURNAL ARTICLE AU - Shreena Umit Patel AU - Ruhaid Khurram AU - Anjali Lakhani AU - Bernadine Quirk TI - Guillain-Barre syndrome following the first dose of the chimpanzee adenovirus-vectored COVID-19 vaccine, ChAdOx1 AID - 10.1136/bcr-2021-242956 DP - 2021 Apr 01 TA - BMJ Case Reports PG - e242956 VI - 14 IP - 4 4099 - http://casereports.bmj.com/content/14/4/e242956.short 4100 - http://casereports.bmj.com/content/14/4/e242956.full SO - BMJ Case Reports2021 Apr 01; 14 AB - Prevention strategies for COVID-19 transmission are at the forefront of healthcare paradigms worldwide, the main emphasis of which is vaccination. We present an interesting case of a 37-year-old man who, 3 weeks following his first dose of the chimpanzee adenovirus-vectored COVID-19 vaccine, ChAdOx1, presented to hospital with a rapidly progressive ascending muscle weakness and back pain in the absence of any other triggers. He also had a negative COVID-19 swab during admission. A diagnosis of Guillain-Barre syndrome was confirmed by correlating the clinical features with cerebrospinal fluid analysis, nerve conduction studies and MRI of the brain and whole spine. The patient received treatment with 5 days of intravenous immunoglobulin and did not require any respiratory support. He was also regularly reviewed by a multidisciplinary team consisting of neurologists, speech and language therapists, and physiotherapists and is on the course to a recovery.