|Anandaraman, N - USDA-FSIS|
|Dargatz, D - USDA-APHIS-VS-CEAH|
|Headrick, M - FDA-CVM|
Submitted to: National Foundation for Infectious Disease
Publication Type: Proceedings
Publication Acceptance Date: February 27, 2005
Publication Date: June 27, 2005
Citation: Cray, P.J., Anandaraman, N., Dargatz, D.A., Headrick, M.L. 2005. Perspective on multi-drug resistant salmonella enterica serotype typhimurium definitive phage type 104 from the animal arm of narms. National Foundation for Infectious Disease. Abstract. P3. P. 38. Technical Abstract: Salmonellae are ubiquitous in nature and over 2500 different serotypes have been identified. The top 25 serotypes identified from 1997 through 2004 as part of the Animal Arm of the National Antimicrobial Resistance Monitoring System (NARMS) accounted for 83.5% of the total number of isolates tested (n=44,182). Of these, S. Typhimurium is frequently associated with human illness. Recently, multi-drug resistance (MDR; resistance to > two antimicrobials) has emerged among salmonellae, and illness associated with MDR Typhimurium Definitive Type 104 (DT104) has been observed in the United States, particularly following consumption of raw or undercooked ground beef. Data collected as part of the NARMS program were analyzed to determine if the prevalence of DT104 isolates from various animals had increased over time. From 1997 through 2004, 44,182 isolates were tested. The total number of isolates identified as serotype Typhimurium including var. copenhagen ranged from 13.7% in 1997 to 18.4% in 1999. The total percent of isolates which were confirmed as DT104 was 2.5, 3.4, 3.6, 3.6, 3.2, 2.2, 2.2, and 2.9 for the years 1997 through 2004, respectively. A majority of the DT104 isolates (n=1329) originated from swine (45%) followed by cattle (beef and dairy; 37%) and chicken (8%). These data indicate that the percent of DT104 tested through NARMS among animal sources has not increased over time and that the majority of these did not originate from a cattle source.