Our previous studies found that a dominant serovar of
Salmonella
enterica
isolates from three farms raising broilers in 2014 and 2015 was
serovar Agona and the number of Infantis isolates decreased (the serovar shift). In this
study, 52
S.
Agona strains which isolated between 1993 and 2008, were
compared to the serovar shift clone by molecular epidemiology and phylogenetic analyses,
using pulsed field gel electrophoresis and whole genome sequence analyses. Of the 52
strains, one strain isolated from a human case in 1995 was genetically identical to the
serovar shift clone, even though it was isolated prior to the serovar shift. These results
suggested that the
S
. Agona serovar shift clone had existed in a source
other than chicken penetrated chicken population.
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