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Vaccine Trials Stymied Because Too Many People Already Have Antibodies

  Nearly a quarter of the people in Delhi, India, who volunteered for the COVID-19 virus test vaccine already had antibodies, which automatically eliminated them from vaccine studies. This presents a dilemma for vaccine developers because, if a person already has the antibodies in their body, then it’s difficult to assess whether the vaccine helps trigger an immune reaction, which is what vaccines are designed to do. In essence vaccines are not a cure or a treatment for a...