SARS-CoV-2 spike IgG titres up to 137 days following Comirnaty mRNA COVID-19 vaccination, Israel, February to May 2021 Patalon, Tal and Ben Moshe, Shay and Peretz, Asaf and Neuberger, Ami and Schreiber, Licita and Lazar, Rachel and Supino-Rosin, Lia and Perez, Galit and Mizrahi-Reuveni, Miri and Gazit, Sivan, Eurosurveillance, 27, 2100703 (2022), https://doi.org/10.2807/1560-7917.ES.2022.27.40.2100703