Affiliation:
1. New York City Department of Health, New York, New York
Abstract
ABSTRACT
Strains of newly emerging
Salmonella enterica
subsp.
enterica
(subspecies I) serotype 4,5,12:i:− causing food-borne infections, including a large food poisoning outbreak (
n
= 86) characterized by persistent diarrhea (14% bloody), abdominal pain, fever, and headache, were examined. The organisms were found in the stool samples from the patients. The biochemical profile of the organisms is consistent with that of
S. enterica
subsp. I serotypes, except for decreased dulcitol (13%) and increased inositol (96%) utilization. Twenty-eight percent of the strains showed resistance to streptomycin, sulfonamides, or tetracycline only; all three antimicrobial agents; or these agents either alone or in combination with ampicillin, trimethoprim, and trimethoprim-sulfamethoxazole. None of the serotype 4,5,12:i:− strains showed resistance or decreased susceptibility to chloramphenicol or ciprofloxacin. On pulsed-field gel electrophoresis (PFGE), the strains showed 11 or 12 resolvable genomic fragments with 18 banding patterns and three PFGE profile (PFP) clusters (i.e., PFP/A, PFP/B, and PFP/C). Seventy-five percent of the isolates fingerprinted were closely related (zero to three band differences; similarity [Dice] coefficient, 86 to 100%); 63% of these were indistinguishable from each other (PFP/A
1
). PFP/A
1
was common to all strains from the outbreak and 11 hospital sources. Strains from six other hospitals shared clusters PFP/B and PFP/C. PFP/C
4
, of the environmental isolate, was unrelated to PFP/A and PFP/B. Nine band differences (similarity coefficient, 61%) were noted between PFP/A
1
and PFP/E of the multidrug-resistant
S. enterica
subsp.
enterica
serotype Typhimurium definitive type 104 strains. Whether these emerging
Salmonella
strains represent a monophasic, Dul
−
variant of serotype Typhimurium or
S. enterica
subsp.
enterica
serotype Lagos or a distinct serotype of
S. enterica
subsp. I is not yet known. Some of the phenotypic and genotypic properties of the serotype 4,5,12:i:− strains are described here.
Publisher
American Society for Microbiology
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