Live-attenuated vaccines (see [1]) seem to fit that role, and have been around for ages. I'd be very surprised if they didn't count as drug. [1] https://www.hh

Live-attenuated vaccines (see [1]) seem to fit that role, and have been around for ages. I'd be very surprised if they didn't count as drug. [1] https://www.hhs.gov/immunization/basics/types/index.html https://www.hhs.gov/immunization/basics/types/index.html