There are probably a dozen other things to consider before starting to think about a conclusion.
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The research continues. There’s just no explaining away the fact that 3 different manufacturers all experienced the same phenomena.
Really?
You have the initital batches coming out of the labs. Who are the first to get those doses?
Compare that to the people getting doses from today’s batches.
Its not the drugs that failed, per se. It could liklly be the 95 year old nursing home patient who go the shot first.