I’m not sure we have in full. Development of new antibiotics looks to all sorts of places, and some traditional medicines have been kept or encorporated into chemical ones when they work well enough; witness the success of artemisin. Usnic acid has been used as a topical cream in some countries, but on a commercial scale I gather suffers because of allergic reactions. The problem is these too still need to be checked for efficacy, developed for large scale production, and used carefully so they don’t expire, and that’s been neglected for antibiotics in general.
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