responder

noun
re·​spond·​er | \ ri-ˈspän-dər How to pronounce responder (audio) \

Medical Definition of responder

: one that responds (as to treatment or to an antigen)

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“Responder.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/responder. Accessed 5 Aug. 2020.

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