Outbreaks of SARS-CoV-2 Infections in Nursing Homes during Periods of Delta and Omicron Predominance, United States, July 2021-March 2022. - Wilson WW; Keaton AA; Ochoa LG; Hatfield KM; Gable P; Walblay KA; Teran RA; Shea M; Khan U; Stringer G; Ganesan M; Gilbert J; et al. (Emerging infectious diseases, 2023)