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. 2018 May 29;99(1):136–142. doi: 10.4269/ajtmh.17-0882

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Figure 4. — Rickettsia africae and Rickettsia conorii titer values by days post-onset of symptoms for all confirmed spotted fever group rickettsiosis (SFGR) cases and all confirmed R. africae cases. The first titer value listed is against R. africae; the second titer value is against R. conorii. Red circles are serology titers for patients confirmed as R. africae by polymerase chain reaction (PCR) of tissue/eschar biopsy or swab. Blue circles are serology titers for patients confirmed for SFGR by immunohistochemistry (IHC) on tissue biopsies. Green circles are serology values for patients confirmed for SFGR by a 4-fold increase in titer values by paired serum samples.