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"Those reacted relatively weakly" to what? To PF4 as well? It seems to have a possibility that "reacted relatively weakly" is simply referring to a weak immune response. I am not sure.

Initial studies by Greinacher’s team, posted as a preprint, don’t support that theory either. Among more than 200 patients who had recovered from COVID-19, they found only a few with antibodies that reacted to PF4, and those reacted relatively weakly. More importantly, Greinacher says, the platelet-activating antibodies isolated from VITT patients did not react to the coronavirus spike protein. At a press conference on Friday, Greinacher called the finding “fantastic news for the vaccination program.”

Source: Science

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Among more than 200 patients who had recovered from COVID-19, they found only a few with antibodies that reacted to PF4, and those reacted relatively weakly

Among more than 200 patients who had recovered from COVID-19, they found only a few patients with antibodies that reacted to PF4, and those antibodies reacted relatively weakly to PF4.

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  • So "those" refers to "those antibodies" rather than "those/some patients"?
    – NewPlanet
    Apr 17, 2021 at 23:50
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The sentence is a bit vague, but I would read it to mean that among the 200 patients, they found only a few patients with antibodies that reacted to PF4, and those patients had a mild reaction. The antibodies reacted weakly to PF4.

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