Seems reachable from both mouth and nose. And the nose probably is more likely to stop a higher percentage of droplets before reaching the back.
The nasopharynx area pointed out as highest risk is, afaiu it from my non-qualified perch, just above the point where air from mouth (i.e. the oral cavity) hits the "back" of the windpipe. Direct contact with droplet is obviously less likely, but not unlikely either.
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And since the nearby tissue looks like it'll also be affected it's hard to believe it'd not just spread "upwards" within a short time.
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Oral and nasal mucosa have ACE2 receptorshttps://www.nature.com/articles/s41368-020-0074-x …
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