So-called "thrombotic events" occur for a variety of reasons among intensive care patients, but the rates among Covid-19 patients are far higher than would be otherwise expected.

"I have had 40-year-olds in my ICU who have clots in their fingers that look like they'll lose the finger, but there's no other reason to lose the finger than the virus," Shari Brosnahan, a critical care doctor at NYU Langone told AFP.

A recent paper from the Netherlands in the journal Thrombosis Research found that 31 per cent of 184 patients suffered thrombotic complications, a figure that the researchers called "remarkably high" — even if extreme consequences like amputation are rare.

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