Prevalence of invasive ability and other virulence-associated characteristics in Providencia alcalifaciens strains isolated in São Paulo, Brazil

J Med Microbiol. 1996 Dec;45(6):459-62. doi: 10.1099/00222615-45-6-459.

Abstract

Providencia alcalifaciens is an invasive enteric pathogen. The present study determined the prevalence of invasive ability in P. alcalifaciens strains isolated in São Paulo, Brazil, mainly from patients with diarrhoea. Invasion of HeLa cells was found in 17 (42%) of 41 strains studied. Most (88%) of the invasive strains were isolated from diarrhoeal stools. The invasive property was identified in 50% of P. alcalifaciens strains isolated as pure cultures or from stool samples where no other enteropathogen was identified. All the invasive strains caused actin condensation in infected cells. Plasmid profile analysis showed the presence of plasmids of 35.8-180 kb in 70% of the strains regardless of their invasive ability, suggesting that invasiveness in P. alcalifaciens is not plasmid related. No homology with a probe for gene sequences for invasion of enteroinvasive Escherichia coli and Shigella strains was identified in colony hybridisation assays. The invasive property of P. alcalifaciens was confirmed in the present study, but this characteristic did not predominate among strains isolated from patients with diarrhoea in São Paulo City. The presence of other virulence mechanisms and the role of non-invasive P. alcalifaciens strains as a cause of diarrhoea remain to be established.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Brazil / epidemiology
  • Child
  • Child, Preschool
  • DNA, Bacterial / analysis
  • Diarrhea / epidemiology
  • Diarrhea / microbiology*
  • Enterobacteriaceae Infections / epidemiology
  • Enterobacteriaceae Infections / microbiology*
  • Feces / microbiology
  • HeLa Cells / microbiology
  • Humans
  • Infant
  • Nucleic Acid Hybridization
  • Plasmids / analysis
  • Prevalence
  • Providencia / genetics
  • Providencia / pathogenicity*
  • Virulence

Substances

  • DNA, Bacterial