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Clinical and Diagnostic Laboratory Immunology, Mar 1994, 145-149, Vol 1, No. 2
YF Liu, LC Lim, K Schell, SD Lovrich, SM Callister and RF Schell
We demonstrated that borreliacidal activity caused by immune serum and
complement can easily be differentiated by flow cytometry from killing
activity caused by antimicrobial agents that are commonly used for the
treatment of Lyme disease. Assay suspensions containing normal or immune
serum were incubated with Borrelia burgdorferi in the presence or absence
of ceftriaxone, doxycycline, penicillin, and phosphomycin for 2, 8, 16, and
24 h. Samples containing killing activity were identified by using flow
cytometry and acridine orange. In 30 min, the effects of immune serum and
complement were easily distinguished from the killing of spirochetes by
antimicrobial agents by adding fluorescein isothiocyanate-conjugated goat
anti-hamster immunoglobulin. This simple procedure greatly enhanced the
usefulness of the borreliacidal assay by eliminating a major source of
false-positive reactions.
Copyright © 1994 by the American Society for Microbiology. All rights reserved.
Differentiation of borreliacidal activity caused by immune serum or antimicrobial agents by flow cytometry
Wisconsin State Laboratory of Hygiene, University of Wisconsin, Madison 53706, USA.
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