FIG. 4.

ApoI digestion profiles of rpoB amplicons from either B. henselae or B. quintana. Ethidium bromide-stained agarose gels of ApoI restriction endonuclease digests of DNA amplified by using primers 1400F and 2300R are shown. Lane A, molecular mass (marker IV; Boehringer); lanes 1 to 5, DNA extracts from blood of patients infected with B. quintana; lanes 6 to 10, DNA extracts from lymph node or pus aspirate samples from patients suspected of having cat scratch disease and identified as B. henselae-positive samples. Numbers on the left are in base pairs.