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Using protocols designed for the isolation of Shigella from environmental freshwater samples from different regions of Bangladesh, 11 bacterial strains giving rise to Shigella-like colonies on selective agar plates and showing serological cross-reaction with Shigella-specific antisera were isolated. Phylogenetic analyses revealed that three of the isolates were most closely related to Escherichia coli, four to Enterobacter sp., two to Stenotrophomonas, and two isolates belonged to the Gram-positive genus Aerococcus. The isolates cross-reacted with six different serotypes of Shigella and were, in each case, highly type-specific. Two of the isolates belonging to the Enterobacter and Escherichia genera gave extremely strong cross-reactivity with Shigella dysenteriae and Shigella boydii antisera, respectively. The Aerococcus isolates gave relatively weak but significant cross-reactions with S. dysenteriae. Western blot analysis revealed that a number of antigens from the isolates cross-react with Shigella spp. The results indicate that important Shigella spp. surface antigens are shared by a number of environmental bacteria, which have implications for the use of serological methods in attempts for the detection and recovery of Shigella from aquatic environments.

current microbiology

Serological Cross-Reactivity of Environmental Isolates of Enterobacter, Escherichia, Stenotrophomonas, and Aerococcus with Shigella spp.-Specific Antisera