Why did one group have a placebo injected before being exposed to the virus?
A. They were part of the control group
B. They were part of the experimental group
C. They would be protected from the disease
D. They would exposed to a weakened form of the virus
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CONTROL GROUP
Explanation:
- The group injected with placebo is a part of the control group
- As the cases of covid 19 continue to increase. an effective vaccine should be needed.
- For it scientists have to do a challenge trial, normally it is not considered but these are extraordinary times.
- In the trial, healthy adult volunteers are divided into two groups. one group received a placebo and the other receives the potential vaccine.
- After some time both groups are injected with the virus, to see whether the vaccine offers protection or not.
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