What can T cells do according to the news? [originaltext]Recent studies show tha

Recent studies show that some recovered patients who tested negative for coronavirus antibodies developed T cells in their immune systems.The reaction is believed to be the result of their COVID-19 infection.The studies are small and have yet to be confirmed by outside experts.However, some scientists now say that people who show few signs of sickness from the new coronavirus, or show no signs at all，may be actually killing off the infection with their T cells.The findings add to the evidence that an effective COVID-19 vaccine will need to push T cells to work in addition to producing antibodies.