Shorter serial intervals in SARS-CoV-2 cases with Omicron BA.1 variant compared with Delta variant, the Netherlands, 13 to 26 December 2021 Backer, Jantien A and Eggink, Dirk and Andeweg, Stijn P and Veldhuijzen, Irene K and van Maarseveen, Noortje and Vermaas, Klaas and Vlaemynck, Boris and Schepers, Raf and van den Hof, Susan and Reusken, Chantal BEM and Wallinga, Jacco, Eurosurveillance, 27, 2200042 (2022), https://doi.org/10.2807/1560-7917.ES.2022.27.6.2200042