PCR amplicons of 16S rRNA (928 bp), 444 Ep-ank (444 bp), and groESL heat shock operon (1,715 bp) genes from naturally infected with granulocytic ehrlichiae in horses from Sierra (CASIGR, CASIPE, CASIJA, CASICH, CASIRN, and CASITL), Mendocino (CAMEBS, CAMELI, and CAMEDO), Sonoma (CASOLJ), and Marin (CAMAWI) counties, California, and in a human from Humboldt county, California (CAHU-HGE1 and CAHU-HGE2). M, Molecular marker; C, double-distilled water; P, positive HGE agent control.