Document Detail

Comparison of genetic and physiological properties of Salmonella enterica isolates from chickens reveals one major difference between serovar Kentucky and other serovars: response to acid.
MedLine Citation:
PMID:  19415975     Owner:  NLM     Status:  MEDLINE    
For unknown reasons, Salmonella enterica Kentucky has become the serovar most frequently isolated from chickens and chicken carcasses in the United States. In an attempt to identify traits that may underlie this phenomenon, genetic and physiological features of 30 serovar Kentucky chicken isolates were compared with those of chicken isolates belonging to a range of other S. enterica serovars. Most of the well-known Salmonella virulence genes were detected in the serovar Kentucky isolates by PCR, but the cdtB, spvB, spvC, and pefA genes were not found. The serovar Kentucky isolates were as invasive as the non-Kentucky isolates in in vitro assays involving chicken embryo hepatocytes, but were less invasive than the Enteritidis, Mbandaki, and Typhimurium isolates when incubated with human HCT-8 cells. Statistical comparison of growth, biofilm formation, and stress survival data from the serovar Kentucky and those from the serovar Enteritidis, Hadar, Mbandaka, Senftenberg, Typhimurium, and Worthington isolates demonstrated either no differences or differences with only a few of the serovars; however, three data sets were different. These data sets included the OD(600) values of cultures grown in tryptic soy broth (TSB) adjusted to pH 5.5 with acetic acid and survival counts of cells grown in either TSB pH 7 or TSB adjusted to pH 5.5 with acetic acid and then transferred into TSB adjusted to pH 2.5 with HCl. Most notable was the log(10) reduction for acetic acid pre-exposed Kentucky isolates of 3.1 versus <1 log(10) for the other isolates upon transfer to pH 2.5. The connection, if any, between this acid response phenotype and the prevalence of the serovar Kentucky in poultry remains to be elucidated, but it is possible that slightly better growth in the presence of acetic acid in conjunction with not mounting a strong, energy-consuming acetic acid-induced adaptive acid response provides a small competitive advantage to this serovar in low acid environments such as the cecum where the pH is around 5.5.
Rolf D Joerger; Casey A Sartori; Kalmia E Kniel
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Foodborne pathogens and disease     Volume:  6     ISSN:  1556-7125     ISO Abbreviation:  Foodborne Pathog. Dis.     Publication Date:  2009 May 
Date Detail:
Created Date:  2009-05-06     Completed Date:  2009-07-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101120121     Medline TA:  Foodborne Pathog Dis     Country:  United States    
Other Details:
Languages:  eng     Pagination:  503-12     Citation Subset:  IM    
Department of Animal and Food Sciences, University of Delaware, Newark, Delaware 19716-2150, USA.
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MeSH Terms
Acetic Acid / pharmacology*
Adaptation, Physiological* / drug effects
Cecum / chemistry,  microbiology
Chickens / microbiology*
Colony Count, Microbial
Consumer Product Safety
Culture Media / chemistry
Hydrogen-Ion Concentration
Salmonella enterica / drug effects,  growth & development,  pathogenicity,  physiology*
Sodium Chloride / pharmacology*
Virulence Factors / genetics
Reg. No./Substance:
0/Culture Media; 0/Virulence Factors; 64-19-7/Acetic Acid; 7647-14-5/Sodium Chloride

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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