Health chiefs have admitted that as many as one in five throat swab tests for the Covid-19 virus may deliver false negatives.

According to the Irish Independent, the figure could be even higher in circumstances where the tests are not taken from swab sites sufficiently deep in the nasal cavity.

It comes as doctors at several Irish hospitals became concerned when such swab tests either failed to confirm Covid-19 in patients displaying symptoms or registered different results from blood tests.

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