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Scheme of the experiment for groups of mice with primary infection with A. phagocytophilum Dawson isolate. Group I, control without an infectious challenge; group II, mice subjected to a homologous challenge; group III, mice subjected to a heterologous challenge; group IV, control without the primary infection. Four similar groups of mice were designated for primary infection with A. phagocytophilum Gaillard isolate.
