February 19, 2021:
Long-Term Studies Of COVID-19 Vaccines Hurt By Placebo Recipients Getting Immunized
Dr. Steven Goodman, a clinical trials specialist at Stanford University, says losing those control groups makes it more difficult to answer some important questions about COVID-19 vaccines.
“We don’t know how long protections lasts,” he says. “We don’t know efficacy against variants — for which we definitely need a good control arm — and we also don’t know if there are any differences in any of these parameters by age or race or infirmity.”
Ms. Cat’s Chronicles 