Treating relapsing fever treatment or syphilis. Were you not paying attention?
"The overall rate of JH reaction was 31.5% (34.6% in HIV-infected patients and 25.2% in HIV-uninfected patients). In multivariate analysis, risk factors for JH reaction included high rapid plasma reagin (RPR) titers, early syphilis, and prior penicillin treatment (PubMed)."
Supportive. Try steroids, fluids, benadryl® (my one brand name).
ICD9 Codes (Soon to be supplanted by ICD10)