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How can a volunteer study and test vaccines against Covid-19 disease? Governments and companies create websites where interested persons can register.
Enthusiasm is high and interest is high: In the United States alone, more than 400,000 people have joined a registry of potential volunteers created by the US National Institutes of Health.
However, according to his post Associated PressBefore someone rushes to sign up, you must first understand how the survey works. 
What the studies predict
Initial studies include only a few dozen young, healthy volunteers, as this is the first chance for scientists to see if the only vaccine being tested is causing a dangerous reaction in humans. Older adults, anyone with a serious underlying illness, and pregnant women are generally excluded from this testing phase.
The midterm studies involve several hundred people, including some older adults. The focus is on comparing the way the human immune system reacts to different doses, as well as gaining more safety data.
In the final studies, the scientists need tens of thousands of volunteers who reflect the diversity of the population, including those at high risk for serious illness from the virus. Thus, the volunteers include people over 65 and people with chronic health problems such as diabetes.
Several study participants must be exposed to the virus so researchers can know if the vaccine works. That is why key employees, such as supermarket or carrier employees who come into frequent contact with others, are preferred for the final phase of testing. It is also the reason why researchers select people from places where the virus spreads and not from areas that control it, so even if one meets the eligibility criteria, one cannot participate due to where they live.
However, it is worth noting that the volunteers do not know whether they are receiving the regular or placebo vaccine.
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