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prevalence of listeria monocytogenes subtypes in bulk milk of the pacific northwest.the prevalence of listeria monocytogenes in bulk milk from three pacific northwest states was assessed for 474 herds at three time points. for samples collected in november 2000 and june 2001, the l. monocytogenes prevalence levels were 4.9 and 7.0%, respectively. all isolates were subtyped by serotyping and by pulsed-field gel electrophoresis (pfge). forty-nine of the 55 isolates belonged to serogroup 1/2a, while 6 belonged to serogroup 4. subtyping by pfge revealed that isolates from 31 herds ...200312929828
whole genome sequencing analyses of listeria monocytogenes that persisted in a milkshake machine for a year and caused illnesses in washington state.in 2015, in addition to a united states multistate outbreak linked to contaminated ice cream, another outbreak linked to ice cream was reported in the pacific northwest of the united states. it was a hospital-acquired outbreak linked to milkshakes, made from contaminated ice cream mixes and milkshake maker, served to patients. here we performed multiple analyses on isolates associated with this outbreak: pulsed-field gel electrophoresis (pfge), whole genome single nucleotide polymorphism (snp) a ...201728619007
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