Even if experts say that a vaccine for COVID-19 will be easier to develop than an AIDS vaccine — estimates for when it will be widely available vary. Here’s what we know at this point 👇
So it's hardly surprising that, around the world, anticipation is high. With more than 100 coronavirus vaccines under development, researchers are reasonably confident that at least one will be successful. Skeptics, and there are some, remind us that optimism about an AIDS vaccine was once high, and 40 years later there is no vaccine.
The way you know that the vaccine is effective is that you give a vaccine to one group of people and another group gets a sham injection that doesn't contain the vaccine being tested. Then you see if the vaccinated group is protected. fraction of them will be exposed to the virus. The number you need to vaccinate depends on how prevalent the coronavirus is in the area where the vaccine is being tested. You then compare the vaccinated group with another group that received a sham vaccine to look for efficacy.
"You have to put a product into a sterile vial or syringe, and there's only so much of that glass to go around," says Is it possible that we don't get just one vaccine but that multiple vaccines are developed that might work even in somewhat different ways?
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