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(A) Annual incidence (per million population) of reported Ehrlichia chaffeensis ehrlichiosis for 2019 [9]; (B) Reviewed cases according to diagnostic certainty; A+, diagnosed by PCR, culture and/or immunostaining of biopsy/autopsy tissue; A, diagnosed by paired IgG IFA serology; B+, diagnosed by microscopy of blood smear or buffy coat preparation; B, diagnosed by single IgG IFA serology.
