Objective—To determine whether Salmonella spp
could be isolated from the environment of free stall
dairies in Wisconsin without any history of clinical salmonellosis
and determine the serotype and antimicrobial
susceptibility of any Salmonella isolates recovered
from the environment.
Study Population—20 free stall dairies with no history
of clinical salmonellosis.
Procedures—Dairy owners completed a questionnaire
regarding management and production practices.
Multiple swab samples were obtained from
throughout the free stall facilities and submitted for
bacterial culture for Salmonella spp. Odds ratios were
calculated to compare herd-level risk factors between
dairies from which Salmonella organisms were isolated
and herds from which Salmonella organisms were
Results—Salmonella organisms were isolated from 9 of
the 20 (45%) dairies. Salmonella serotype Meleagridis
was isolated from 4 dairies, S Meleagridis and S
Kentucky were isolated from 2 dairies, S Meleagridis and
S Cyprus were isolated from 1 dairy, S Cerro was isolated
from 1 dairy, and S Corvallis was isolated from 1
dairy. All isolates were susceptible to all antimicrobial
agents tested. None of the potential risk factors analyzed
demonstrated a significant association with an
increased likelihood of isolating Salmonella spp.
Conclusions and Clinical Relevance—Environmental
Salmonella contamination was demonstrated on free
stall dairies with no history of clinical salmonellosis.
(J Am Vet Med Assoc 2004;225:574–577)