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Detection ofLegionella antibodies by enzyme-linked immunosorbent assay (ELISA) using whole cell and carbohydrate antigens

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Abstract

The systematic study ofLegionella as a human pathogen and a bacterium widely disseminated in the environment requires simplification of present methodology. We describe a highly sensitive enzyme-linked immunosorbent assay (ELISA) for the detection of serum antibodies that can also be used for the detection of antigen.Legionella pneumophila serogroups 1 and 3 (Philadelphia 2 and Bloomington 2),L. bozemanii (WIGA), andL. micdadei (TATLOCK) were grown in diphasic medium consisting of charcoal yeast extract agar (CYE) overlayed with yeast extract medium (YEM) for the production of whole cell antigen and CYE for the extraction of carbohydrate antigen. The whole cells were inactivated with 0.5% formalin. The carbohydrate was obtained from the supernatant of cells resuspended twice in phosphate buffered saline (PBS). The antigen was sterilized and concentrated by filtration and purified by chromatography through a Sepharose 4B column. The highest molecular weight fractions were used for chemical characterization, which confirmed the carbohydrate nature of the antigen, and for micro-ELISA. Titers ranging from 5×103 to 3×105 (inverse of serum dilutions) were obtained from rabbit sera collected after 1, 2, or 3 injections of whole cells. The titers were somewhat higher and more consistent with the higher of 2 antigen concentrations used (5 or 15μg/ml protein or dry weight), and with the carbohydrate rather than the whole cell antigen. The reactions were serogroup and species specific and only low titers were obtained with some of the heterologous antigens. The sensitivity and specificity of the reactions were not diminished when as many as 4 antigens were mixed in the same well. Thus, the micro-ELISA can be used as a test of highly specific antigens as well as a screening test with mixtures of antigens. A preliminary test withLegionella containing water specimen concentrates and high-titer rabbit sera indicated that the micro-ELISA can also be used for the detection of antigen. This investigation appears to have paved the way for the simplification of the serological methodology for the study ofLegionella.

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Authors and Affiliations

  1. Naval Medical Research Institute, 20814, Bethesda, Maryland, USA

    Helen N. Westfall, William F. Myers & Emilio Weiss

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  1. Helen N. Westfall
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  2. William F. Myers
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  3. Emilio Weiss
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On temporary leave from: Department of Microbiology, University of Maryland School of Medicine, 660 West Redwood Street, Baltimore, MD 21201.

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Westfall, H.N., Myers, W.F. & Weiss, E. Detection ofLegionella antibodies by enzyme-linked immunosorbent assay (ELISA) using whole cell and carbohydrate antigens. Microb Ecol 8, 287–298 (1982). https://doi.org/10.1007/BF02010669

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