Blood clots only affect less than 1 in 200,000 recipients of the Astra Zeneca vaccine, and mortality is low, at around 1 in a million. But even this tiny risk has caused a lot of vaccine hesitancy in Australia, where the government bet big on just that one vaccine manufacturer.

Even though the risk is small, it was scary because they didn't know the mechanism causing the clots, so it was possible that worse problems would become apparent later on.

If this scientist has identified the mechanism, and a fix is implemented, it would remove the uncertainty about the Astra Zeneca vaccine.

Or would it?

Once something like this is out, and vaccine hesitancy gains a following, reversing its momentum might not be as easy is publishing science.