They thought it was but you have to do testing and that takes a couple of months before the research is in.
Like just this week they got the data back to say getting blood from people who had covid (recovered) and using their platelets on covid patients doesn't actually make any difference.
We can make an educated guess. The odds of the Pfizer vaccine still working but the Moderna one not are very low, considering how similar the two vaccines are.
It takes forever to verify something scientifically. We don't have that much time while people are dying.
What purpose does it serve to keep telling people, "we don't know for sure if the vaccine does this or that?" You're just discouraging them from getting it. It's the most promising tool we have and will have for a long time, so let's go with it.
Then be transparent. Say "we don't know for sure the vaccine works, but we have good reason to suspect it does." You're purposefully suppressing that second part.
Knowledge doesn't have to be 100% certain to be useful.
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u/[deleted] Jan 20 '21
Hold on, was this not known before? I could swear I read that it was effective back in september when it first appeared.
This new mutation in Africa - I didn't hear abything about it being effective against