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" ... Their findings were encouraging. When exposing human T-cells from a wide range of hosts previously infected with Covid-19 to a number of SARS-CoV-2 variants, the T-cell response held up well. Responses decreased at most 30% relative to that cell’s response to the SARS-CoV-2 wild type. In some cases, such as the South Africa variant, T-cells produced a nearly equal response to the variant as the unmutated virus. ... "