title: Within-Farm Changes in Dairy Farm-Associated Salmonella Subtypes and Comparison to Human Clinical Isolates in Michigan, 2000-2001 and 2009.
abstract: Temporal changes in the distribution of Salmonella subtypes in livestock populations may have important impacts on human health. The first objective of this research was to determine the within-farm changes in the population of subtypes of Salmonella on Michigan dairy farms that were sampled longitudinally in 2000-2001 and again in 2009. The second objective was to determine the yearly frequency (2001 through 2012) of reported human illnesses in Michigan associated with the same subtypes. Comparable sampling techniques were used to collect fecal and environmental samples from the same 18 Michigan dairy farms in 2000-2001 and 2009. Serotypes, multilocus sequence types (STs), and pulsed-field gel electrophoresis (PFGE) banding patterns were identified for isolates from 6 farms where >1 Salmonella isolate was recovered in both 2000-2001 and 2009. The distribution of STs was significantly different between time frames (P < 0.05); only two of 31 PFGE patterns were identified in both time frames, and each was recovered from the same farm in each time frame. Previously reported within-farm decreases in the frequency of multidrug-resistant (MDR) Salmonella were due to recovery of MDR subtypes of S. enterica serotypes Senftenberg and Typhimurium in 2000-2001 and genetically distinct, pansusceptible subtypes of the same serotypes in 2009. The annual frequency of human illnesses between 2001 and 2012 with a PFGE pattern matching a bovine strain decreased for patterns recovered from dairy farms in 2000-2001 and increased for patterns recovered in 2009. These data suggest important changes in the population of Salmonella on dairy farms and in the frequency of human illnesses associated with cattle-derived subtypes.
authors.affiliation: Center for Comparative Epidemiology, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan, USA.
authors.forename: Greg G
authors.initials: GG
authors.lastname: Habing
authors.affiliation: Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, USA.
authors.forename: Shannon
authors.initials: S
authors.lastname: Manning
authors.affiliation: Diagnostic Center for Population and Animal Health, Michigan State University, East Lansing, Michigan, USA.
authors.forename: Carole
authors.initials: C
authors.lastname: Bolin
authors.affiliation: Department of Statistics and Probability, Michigan State University, East Lansing, Michigan, USA.
authors.forename: Yuehua
authors.initials: Y
authors.lastname: Cui
authors.affiliation: Infectious Disease Division, Michigan Department of Community Health, Lansing, Michigan, USA.
authors.forename: James
authors.initials: J
authors.lastname: Rudrik
authors.affiliation: Infectious Disease Division, Michigan Department of Community Health, Lansing, Michigan, USA.
authors.forename: Stephen
authors.initials: S
authors.lastname: Dietrich
authors.affiliation: Center for Comparative Epidemiology, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan, USA kaneenej@cvm.msu.edu.
authors.forename: John B
authors.initials: JB
authors.lastname: Kaneene
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D002417:Cattle; D002418:Cattle Diseases / Q000382:microbiology*; D006801:Humans; D008824:Michigan; D008826:Microbial Sensitivity Tests; D008969:Molecular Sequence Data; D010802:Phylogeny; D012475:Salmonella / Q000145:classification / Q000187:drug effects / Q000235:genetics / Q000302:isolation & purification*; D012480:Salmonella Infections / Q000382:microbiology*; D012481:Salmonella Infections, Animal / Q000382:microbiology*; D012703:Serotyping
chemical_list: D000900:Anti-Bacterial Agents