I’m a volunteer in the clinical trials for the Pfizer vaccine. I knew there was some risk in volunteering to take an unproven medicine. But I hoped that my participation might help me do well against the virus, and might also help me do good for humanity. My efforts to do well and do good have worked out fine, until now.
Understand that these studies are conducted with two distinct groups. One group gets the vaccine. The other group gets a placebo. The placebo is not medicine. It’s a simple saline shot that does nothing at all.
The reason for these two groups is to establish a placebo-taking “control group” against which both the efficacy and side effects of the vaccine can be measured in the vaccine-taking group. The study is “blinded,” meaning that the patients themselves don’t know whether they got the vaccine or the placebo. That’s to avoid tainting the results with “placebo effect” and “reverse placebo effect” symptoms.