Jarisch-Herxheimer reaction
noun
Ja·risch-Herx·hei·mer reaction
ˈyä-rish-ˈherks-ˌhī-mər-
: an increase in the symptoms of a spirochetal disease (as syphilis, Lyme disease, or relapsing fever) occurring in some persons when treatment with spirocheticidal drugs is started
called also Herxheimer reaction
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Merriam-Webster unabridged
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