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Western blot analysis of IgG (heavy and light chains) of IFA-positive CSD sera (lanes 1 to 7) reacted against B. henselae (a) and B. quintana (b) antigens. Lanes 1 to 4 contain sera from patients with PCR-confirmed B. quintana infection. Positions of molecular size standards (in kilodaltons) are indicated at the right. An arrow in each panel denotes the location of Bh83.
