We examined the population dynamics of Salmonella enterica serovar Typhimurium during seasonal salmonellosis epidemics in New South Wales, Australia, during 2009-2016. Of 15,626 isolates, 5%-20% consisted of novel genotypes. Seasons with salmonellosis epidemics were associated with a reduction in novel genotypes in the preceding winter and spring.
Keywords: Salmonella enterica serovar Typhimurium; bacteria; enteric infections; epidemics; genotyping; molecular epidemiology; population diversity; salmonella.