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Mean microimmunofluorescence antibody (IFA) titers for dogs in the uninfected control (no seroconversion), infected control, homologous challenge, and heterologous challenge groups after transfusion of E. canis-infected blood (day 0), after the initiation of doxycycline treatment (day 30), and after challenge inoculation (day 90). The equivalent reciprocal IFA titers are given in parentheses.
