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A heads up not to get too worked up by this. A small study with an average age of 30 and not enough data to find even a single severe case or hospitalization (even with placebo)... Claims that the astrazeneca vaccine doesn't demonstrate efficacy against mild-to-moderate covid from the south africa variant. But the more accurate description would be: "not enough data collected to draw any firm conclusions about this vaccine."
We need more time and data to see how much of a threat the variants will be, but so far the larger studies have been reassuring.
But also a good reminder that we're not out of the woods yet.
to follow-up on this, T cells (as Blake P has brought up multiple times) may be what makes the difference in stopping severe infections: