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Monoclonal antibodies (MAbs) against membrane preparations of Helicobacter pylori were produced. One MAb was found to be specific for H. pylori, because it did not react with a number of other bacterial species, including Helicobacter felis and Campylobacter jejuni. This MAb reacted with a 30-kDa protein found in outer membrane preparations of H. pylori. The protein was also detected on the cell surface on intact bacteria when analyzed by immunoelectron microscopy. To facilitate the identification of H. pylori isolates after culturing of biopsies, an immunodot blot assay based on the reaction of this MAb was developed. This assay was found to be highly specific for H. pylori. Sixty-six clinical isolates typed as H. pylori by conventional biochemical tests were found to be positive, whereas no other bacterial species tested gave a positive result. By this method, reliable and rapid identification of H. pylori could be accomplished.

journal of clinical microbiology

Identification of Helicobacter pylori by immunological dot blot method based on reaction of a species-specific monoclonal antibody with a surface-exposed protein