Epidemiological and clinical characteristics of vaccinated COVID-19 patients: A meta-analysis and systematic review.
Wen TianXingxiang RenMei HanYuanyuan ZhangXu GaoZhihai ChenWei ZhangPublished in: International journal of immunopathology and pharmacology (2022)
Compared with the vaccinated group, patients in the unvaccinated group had a more severe clinical manifestations. Vaccines are also protective for infected people.