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Salmonella enterica subsp. enterica serovar Hadar str. RI_05P066

In recent years, S. Heidelberg has been the third or fourth most common Salmonella serotype causing disease in the U.S., estimated at 84,000 cases of illness annually. Epidemic outbreaks of S. Heidelberg present a significant economic burden to healthcare systems in the United States and elsewhere, although studies have failed to elucidate the genetic factors of S. Heidelberg that make it a particularly virulent serovar. The recent rise in S. Heidelberg in the United States is accompanied by a concomitant increase in antimicrobial resistance. MDR strain SL476 (NARMS alternate designations: CVMN418, CVM30485) and antibiotic susceptible strain SL486 were chosen from this serotype.