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Longer follow-ups with comparison groups are needed to clarify the potentially increased risk of neurodegenerative diseases in COVID-19 survivors, namely those infected before mass vaccination.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>A prospective study started in July 2022 with four cohorts of 150 individuals each, defined according to SARS-CoV-2 infection and hospitalisation status between March 2020 and February 2021: cohort 1\u2014hospitalised due to SARS-CoV-2 infection; cohort 2\u2014hospitalised, COVID-19-free; cohort 3\u2014infected, not hospitalised; cohort 4\u2014not infected, not hospitalised. Cohort 2 will be matched to cohort 1 according to age, sex, level of hospitalisation care and length of stay; cohort 4 will be age-matched and sex-matched to cohort 3. Baseline, 1-year and 2-year follow-up evaluations will include: cognitive performance assessed with the Montreal Cognitive Assessment (MoCA) and neuropsychological tests; the assessment of prodromal markers of PD with Rapid Eye Movement Sleep Behaviour Disorder single-question Screen and self-reported olfactory and gustative alterations; screening of PD with the 9-item PD screening questionnaire; gait evaluation with Timed Up&amp;Go test. Suspected cases of cognitive impairment and PD will undergo a clinical evaluation by a neurologist. Frequency measures of neurological complications, prodromal markers and diagnoses of dementia and PD, will be presented. The occurrence of cognitive decline\u2014the difference between baseline and 1-year MoCA scores 1.5 SD below the mean of the distribution of the variation\u2014will be compared between cohorts 1 and 2, and cohorts 3 and 4 with OR estimated using multivariate logistic regression.<\/jats:p><\/jats:sec><jats:sec><jats:title>Ethics and dissemination<\/jats:title><jats:p>This study received ethics approval from the Ethics Committees of the health units Unidade Local de Sa\u00fade de Matosinhos and Centro Hospitalar de Entre Douro e Vouga, and informed consent is signed for participating. Results will be disseminated among the scientific community and the public.<\/jats:p><\/jats:sec>","DOI":"10.1136\/bmjopen-2023-072981","type":"journal-article","created":{"date-parts":[[2023,7,31]],"date-time":"2023-07-31T03:00:46Z","timestamp":1690772446000},"page":"e072981","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":8,"title":["Long-term neurological complications in COVID-19 survivors: study protocol of a prospective cohort study (NeurodegCoV-19)"],"prefix":"10.1136","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1652-8999","authenticated-orcid":false,"given":"Nat\u00e1lia","family":"Ara\u00fajo","sequence":"first","affiliation":[]},{"given":"Isa","family":"Silva","sequence":"additional","affiliation":[]},{"given":"Patr\u00edcia","family":"Campos","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3476-9040","authenticated-orcid":false,"given":"Rita","family":"Correia","sequence":"additional","affiliation":[]},{"given":"Margarida","family":"Calejo","sequence":"additional","affiliation":[]},{"given":"Pedro","family":"Freitas","sequence":"additional","affiliation":[]},{"given":"Mariana","family":"Seco","sequence":"additional","affiliation":[]},{"given":"Lu\u00eds","family":"Ribeiro","sequence":"additional","affiliation":[]},{"given":"Ana Rute","family":"Costa","sequence":"additional","affiliation":[]},{"given":"Samantha","family":"Morais","sequence":"additional","affiliation":[]},{"given":"Susana","family":"Pereira","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9410-633X","authenticated-orcid":false,"given":"Jo\u00e3o","family":"Firmino-Machado","sequence":"additional","affiliation":[]},{"given":"Rita","family":"Rodrigues","sequence":"additional","affiliation":[]},{"given":"Joana","family":"Pais","sequence":"additional","affiliation":[]},{"given":"Lu\u00eds","family":"Ruano","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1870-1430","authenticated-orcid":false,"given":"Nuno","family":"Lunet","sequence":"additional","affiliation":[]},{"given":"V\u00edtor","family":"Tedim-Cruz","sequence":"additional","affiliation":[]}],"member":"239","published-online":{"date-parts":[[2023,7,30]]},"reference":[{"key":"2023073020000899000_13.7.e072981.1","unstructured":"Statement on the fourteenth meeting of the International Health Regulations 2005 . 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