Effect of SARS-CoV-2 vaccination among health care workers in a geriatric care unit after a B.1.1.7-variant outbreak. (September 2021) - Tanislav, C.; El Ansari, T.; Meyer, M.; Müller, M.; Grübener, R.; Stein, T.; Niemöller, U.; Baaske, J.; Kostev, K.; Rolfs, A.; Rosenbauer, J.