claim: coronavirus vaccines work through safety trials
evidence_1: vaccines expose the immune system to components of a virus  the coronavirus spike protein, in the case of nearly all covid-19 vaccines  in the hope of teaching it how to react against a real infection in the future.", "in the past few days, scientists working at feverish pace to develop vaccines against the coronavirus have released a flood of data from their first human trials.", "the vaccine is inducing the kind of immune responses that we think are inducing protection against coronavirus, said sarah gilbert, a vaccinologist co-leading the oxford effort, in a press briefing announcing the results.", 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  "but they suggest that the candidate vaccines are broadly safe, and offer the first hints that vaccines can summon immune responses similar to those of people who have been infected with the virus.", "its definitely plausible that theres more than one way to protect against this virus. the nature of the immune response that protects  or fails to protect  against covid-19 will become clearer when efficacy trials deliver their first results.")