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Infection and Immunity, January 1999, p. 30-35, Vol. 67, No. 1
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Influence of Outer Surface Protein A Antibody on
Borrelia burgdorferi within Feeding Ticks
Aravinda M.
de
Silva,1,
Nordin S.
Zeidner,2
Yan
Zhang,1
Marc C.
Dolan,2
Joseph
Piesman,2 and
Erol
Fikrig1,*
Section of Rheumatology, Department of
Internal Medicine, Yale University School of Medicine, New Haven,
Connecticut 06520,1 and
Centers for
Disease Control, Public Health Service, U.S. Department of Health
and Human Services, Fort Collins, Colorado 805222
Borrelia burgdorferi, the spirochetal agent of Lyme
disease, is transmitted by Ixodes ticks. When an infected
nymphal tick feeds on a host, the bacteria increase in number within
the tick, after which they invade the tick's salivary glands and
infect the host. Antibodies directed against outer surface protein A (OspA) of B. burgdorferi kill spirochetes within feeding
ticks and block transmission to the host. In the studies presented
here, passive antibody transfer experiments were carried out to
determine the OspA antibody titer required to block transmission to the rodent host. OspA antibody levels were determined by using a
competitive enzyme-linked immunosorbent assay that measured antibody
binding to a protective epitope defined by monoclonal antibody C3.78. The C3.78 OspA antibody titer (>213 µg/ml) required to eradicate spirochetes from feeding ticks was considerably higher than the titer
(>6 µg/ml) required to block transmission to the host. Although spirochetes were not eradicated from ticks at lower antibody levels, the antibodies reduced the number of spirochetes within the feeding ticks and interfered with the ability of spirochetes to induce ospC and invade the salivary glands of the vector. OspA
antibodies may directly interfere with the ability of B. burgdorferi to invade the salivary glands of the vector;
alternately, OspA antibodies may lower the density of spirochetes
within feeding ticks below a critical threshold required for initiating
events linked to transmission.
*
Corresponding author. Mailing address: Section of
Rheumatology, Department of Internal Medicine, Yale University School
of Medicine, 605 Laboratory of Clinical Investigation, 333 Cedar St.,
New Haven, CT 06520-8031. Phone: (203) 785-2454. Fax: (203) 785-7053. E-mail: erol.fikrig{at}yale.edu.

Present address: Department of Microbiology and Immunology, School
of Medicine, University of North Carolina at Chapel Hill,
Chapel Hill,
NC
27599.
Infection and Immunity, January 1999, p. 30-35, Vol. 67, No. 1
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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