Researchers find there was a higher Covid rate among those shielding in Wales than in other people.
However, they did say those shielding were tested more as they used healthcare more often.
"We have to remember that people who were included in the shielded list were clinically vulnerable and having a lot of contact with health services so if they were for instance admitted to hospital, they'd be having a Covid test."Whereas in the general population, Covid tests were fewer - we can't find a positive test if there was no test done. There is some uncertainty around these results.
"There were more deaths and there were more hospital admissions. We are, at this point, thinking that perhaps it was impossible to shield people effectively when there was such a high level of healthcare transmission at that time," she said.
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