claim: b cells and t cells mediate fusion to covid-19
evidence_1: robust immune responses with spike-specific neutralizing antibodies, memory b cells and circulating tfh cells have been found in patients who have recovered from covid-19 infection8.", "humoral and circulating follicular helper t cell responses in recovered patients with covid-19.", "here, we discuss our current understanding of the relative contribution of b cells and t cells to immunity to sars-cov-2 and the implications for the development of effective treatments and vaccines for covid-19.", 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  "these t cells are probably cross-reactive with other hcovs, but whether they can provide protection from covid-19 disease remains to be determined.")