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I don’t think that’s a problem. This is not something new. You can buy a nasal spray with iota-carrageenan in any pharmacy. It’s a product to protect against colds (which are often caused by coronaviruses):
That’s why it’s hard to understand that to prevent a pandemic of a virus that spreads through the upper respiratory tract they didn’t give any guidelines for hygiene/disinfection of the upper respiratory tract. Just “wash your hands”. That’s just not good enough.