{"doi":"10.1016/j.ejro.2022.100456","title":"COVID-19 Vaccination reduced pneumonia severity","abstract":"Purpose: To investigate the effect of vaccinations and boosters on the severity of COVID-19 pneumonia on CT scans during the period of Delta and Omicron variants. Methods: Retrospectively studied were 303 patients diagnosed with COVID-19 between July 2021 and February 2022, who had obtained at least one CT scan within 6 weeks around the COVID-19 diagnosis (-2 to +4 weeks). The severity of pneumonia was evaluated with a 6-point scale Pneumonia Score. The association between demographic and clinical data and vaccination status (booster/additional vaccination, complete vaccination and un-vaccination) and the difference between Pneumonia Scores by vaccination status were investigated. Results: Of 303 patients (59.4 ± 16.3 years; 178 females), 62 (20 %) were in the booster/additional vaccination group, 117 (39 %) in the complete vaccination group, and 124 (41 %) in the unvaccinated group. Interobserver agreement of the Pneumonia Score was high (weighted kappa score = 0.875). Patients in the booster/additionally vaccinated group tended to be older (P = 0.0085) and have more underlying comorbidities (P < 0.0001), and the Pneumonia Scores were lower in the booster/additionally vaccinated [median 2 (IQR 0-4)] and completely vaccinated groups [median 3 (IQR 1-4)] than those in the unvaccinated group [median 4 (IQR 2-4)], respectively (P < 0.0001 and P < 0.0001, respectively). A multivariable linear analysis adjusted for confounding factors confirmed the difference. Conclusion: Vaccinated patients, with or without booster/additional vaccination, had milder COVID-19 pneumonia on CT scans than unvaccinated patients during the period of Delta and Omicron variants. This study supports the efficacy of the vaccine against COVID-19 from a radiological perspective.","journal":"European Journal of Radiology Open","year":2022,"id":271271,"datarank":0.0,"base_score":0.0,"endowment":0.0,"self_citation_contribution":0.0,"citation_network_contribution":0.0,"self_endowment_contribution":0.0,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":13,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.8605,"is_data_producer":false,"deposit_databanks":null,"is_oa":true,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2022-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":275822,"name":"Yi Li","orcid":"0000-0003-1720-2760","position":1,"is_corresponding":false},{"id":311411,"name":"Takuya Hino","orcid":"0000-0002-8225-0737","position":2,"is_corresponding":false},{"id":936159,"name":"Staci Gagne","orcid":"0000-0003-0529-7627","position":3,"is_corresponding":false},{"id":311413,"name":"Vladimir I. Valtchinov","orcid":"0000-0002-3272-4826","position":4,"is_corresponding":false},{"id":936160,"name":"Elizabeth Gay","orcid":"0000-0001-7932-3221","position":5,"is_corresponding":false},{"id":243071,"name":"Mizuki Nishino","orcid":"0000-0003-0275-0502","position":6,"is_corresponding":false},{"id":399249,"name":"Bruno Madore","orcid":"0000-0002-5606-8771","position":7,"is_corresponding":false},{"id":620716,"name":"Charles R.G. Guttmann","orcid":"0000-0002-7006-9762","position":8,"is_corresponding":false},{"id":936664,"name":"Sheila A. Bond","orcid":null,"position":9,"is_corresponding":false},{"id":692409,"name":"Kousei Ishigami","orcid":"0000-0001-8107-5570","position":10,"is_corresponding":false},{"id":267134,"name":"Gary M. Hunninghake","orcid":"0000-0001-9782-2841","position":11,"is_corresponding":false},{"id":40860,"name":"Bruce D. Levy","orcid":"0000-0001-9515-5731","position":12,"is_corresponding":false},{"id":728250,"name":"Kenneth M. Kaye","orcid":"0000-0001-5802-4556","position":13,"is_corresponding":false},{"id":251842,"name":"David C. Christiani","orcid":"0000-0002-0301-0242","position":14,"is_corresponding":false},{"id":253857,"name":"Hiroto Hatabu","orcid":"0000-0003-1436-2988","position":15,"is_corresponding":false},{"id":936158,"name":"Noriaki Wada","orcid":"0009-0001-1727-293X","position":0,"is_corresponding":true}],"reference_count":33,"raw_metadata":null,"created_at":"2026-07-19T00:27:35.206187Z","pmid":"36386765","pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}