Phenotypic and Molecular Characterization of Potentially New Shigella boydii Serotype in Bangladesh

A cluster of six Shigella-like organisms from children with diarrhea in Dhaka is linked to a potentially new provisional S. boydii serovar, sharing identical PFGE and virulence markers.

• Why it matters: Existing Shigella antisera fail to detect about 3% of Shigella isolates as known serotypes, leaving a gap in understanding potentially novel S. boydii diversity driving bacillary dysentery.
• What they did: The study phenotyped and genotyped six SLOs using biochemical tests, serotyping, antimicrobial susceptibility, virulence assays (Sereny), PCR for ipaH and Shigella enterotoxin 2, and PFGE comparisons to known Shigella serotypes.
• The result: All six isolates were mannitol fermenting, invasive, ipaH-positive, carried Shigella enterotoxin 2 and a ~140 MDa virulence plasmid, showed identical PFGE/plasmid profiles distinct from other S. boydii serotypes, and one isolate’s antiserum agglutinated all six but not other Shigella or E. coli references.

AI summary of the abstract · may contain errors · not medical advice · read the paper.