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and Teresa Lozano Long School of Medicine.Online information about COVID nasopharyngeal swabs lacks information warning those with prior extensive sinus or skull base surgery, Dr Chen said."Not one site of the 200 we searched online had information cautioning against blind nasopharyngeal swab testing in those with a history of sinus or skull base surgery," he said.Asked how often swabbing is done incorrectly, Dr Chen said, "We really don't know that.