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.
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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The article says the nose has more, and that this is a candidate explanation for why this virus attacks the nose more than other respiratory viruses...
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