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Interesting point:

>The work, which was posted on the medRxiv preprint server on 12 July and has not yet been peer reviewed

It would be best to wait for this review to be done first, right?

It would but the variant situation is so quickly changing that it can still be useful. A Danish study that shows similar results also released a preprint last week https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4165630