[patcon]

A quick Google seems to indicate that the title is fair:

From news article:

> Up to 30% of patients who are seriously ill with coronavirus are developing dangerous blood clots, according to medical experts.

(One doctor anecdotally thinks its higher)

From journal article https://www.nature.com/articles/d41586-020-01403-8

> Studies from the Netherlands and France suggest that clots arise in 20–30% of critically ill COVID-19 patients. 1,2

But yes, rounding "20-30%" up to "one third" is a bit odd. The news article seems to leave the reader to do their own discovery of sources. So you're not wrong to be skeptical, but you're not right that it's wrong :)

[toolz]

There's a significant difference in hospital patients vs critically ill hospital patients. So yes, the article is wrong.

[cma]

Rounding critically ill down to seriously ill is also misleading, if that is what he did.