CoronavirusFacts: It is impossible to reach the blood-brain barrier through a nasal swab. FactCheck
The nasopharynx is not part of the blood-brain barrier and they are separated by the mucus membrane, the bones of the skull, and meninges. ThisThomas Hartung, a professor at the Johns Hopkins Bloomberg School of Public Health, told the fact check organization
:"[The blood-brain-barrier] is a microscopic structure. No way to reach any of this from the nose – there is a mucus membrane, bones of the scull, meninges, cerebrospinal fluid etc. between."that there are 3 layers of protection in the nose, including the dura mater or the tough lining of the skin around the brain. It would be hard to penetrate through this without something sharp, he said, and it would be"very incredibly unlikely" to be able to do so with a soft swab.
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