We studied the serological cross-reactions among
Bartonella henselae, Chiamydia pneumoniae and
Coxiella burnetii by indirect fluorescence antibody (IFA) method, using sera from 8 patients with cat scratch disease (CSD), 13 patients with
C. pneumoniae infection and 12 patients with acute Q fever.
B. henselae IgG antibody was negative in 13 patients with
C. pneumoniae infection, and was positive in 3 (titers being 1: 64) of 12 patients with Q fever, whereas
B. henselae IgM antibody was negative in all the patients with
C. pneumoniae infection or Q fever.
C. burnetii IgG antibody was removed by absorption of these 3 sera with
C. burnetii antigens, whereas
B. henselae IgG antibody did not change.
C. pneumoniae IgG antibody was positive in 3 (titers being 1: 125 in two, 1: 32 in one) of 8 patients with CSD. Both
C. pneumoniae and
B. henselae IgG antibody titers were significantly reduced by absorption of these 3 sera with
B. henselae antigens.
C. burnetii IgG or IgM antibodies were negative in all patients with CSD.
In conclusion, no serological cross-reaction between
B. henselae and
C. burnetii was observed. On the other hand,
B. henselae IgG antibody cross-reacted to
C. pneumoniae antigens, whereas
C. pneumoniaeIgG antibody did not cross-react to
B. henselae antigens. Our findings suggest that determination of
B. henselae IgG or IgM antibodies were not influenced by
C. pneumoniae and
C. burnetii antigens.
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