First step is testing safety. Then you give it to a much larger group to establish the level of effectiveness, since you need a lot of data to establish that. After the effectiveness is established you would declare it safe AND effective.
It’s the WHO who declared this safe in this writing. Obviously, there have been other authorities that approved the vaccine before injecting it to that million people.
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First step is testing safety. Then you give it to a much larger group to establish the level of effectiveness, since you need a lot of data to establish that. After the effectiveness is established you would declare it safe AND effective.
SMH. Can’t imagine how that’s not obvious.
It’s the WHO who declared this safe in this writing. Obviously, there have been other authorities that approved the vaccine before injecting it to that million people.
Whoa that’s the first one of those I’ve seen on lemmy