AABP Executive Director Dr. Fred Gingrich is joined by Dr. Angel Abuelo, AABP member on faculty at Michigan State University College of Veterinary Medicine. Abuelo presented at the 2025 AABP Recent Graduate Conference in Norman, Okla. on managing Salmonella Dublin. AABP members can listen to this presentation for free by accessing the online CE portal on this page or download the BCI Mobile Conference app from your device’s store. 

Salmonella Dublin is a host-adapted pathogen that results in high morbidity and mortality due to the systemic nature of the disease in calves and in most cases, the pathogen exhibits multi-drug resistance. This pathogen also has implications for human health as a zoonotic disease. Abuelo discusses the clinical presentation in calves is primarily respiratory disease and the carrier state that can be seen in adult cows that serve as a continuous reservoir to maintain the disease on a farm. Diagnostics should include multiple tissues from deceased calves that are necropsied. The best sample to submit in live calves is not feces, but aseptically collected blood cultures. 

Abuelo discusses the nuances of treatment in affected calves and due to multi-drug resistance, response to therapy can be poor or lead to a carrier state in recovered animals. Although enrofloxacin is labeled for treatment of bovine respiratory disease, it is not specifically labeled for treatment of Salmonella Dublin and extralabel use of fluoroquinolones in food animals is prohibited by the FDA. 

Prevention of the disease is multifactorial and includes all aspects of proper neonatal calf management including adequate and timely pasteurized colostrum, maternity pen management, ventilation, sanitation and nutrition. Abuelo also discusses the use of vaccines in cows and calves to manage the disease on endemically infected farms to prevent outbreaks. Continued research on managing this disease, including the use of vaccines and improved diagnostics, will be important topics for veterinarians and producers who are managing this pathogen.

REFERENCES:

Frye E, Jennings C, Kremer K. Aseptic technique for blood culture collection in the field to diagnose Salmonella Dublin in calves. J Am Vet Med Assoc. 2025;263(7):1. https://doi.org/10.2460/javma.25.02.0116. PMID: 40267971. https://avmajournals.avma.org/view/journals/javma/263/7/javma.25.02.0116.xml

Castro-Vargas RE, Cullens-Nobis FM, Mani R, Roberts JN, Abuelo A. Effect of dry period immunization of Salmonella Dublin latent carriers with a commercial live culture vaccine on intrauterine transmission based on the presence of precolostral antibodies in offspring. J Dairy Sci. 2024;107(12):11436-11445. https://doi.org/10.3168/jds.2024-24945

The effect of Salmonella vaccination on Salmonella Dublin blood enzyme-linked immunosorbent assay results. Bov Pract. 2025;59(2), 53-60. https://doi.org/10.21423/bpj20259266

Abuelo A, Renaud D.  Salmonella Dublin Infection in Cattle. Merck Veterinary Manual. 2024. Winter A, Abuelo A, Allen DG, et al. (Eds). Merck, Rahway, NJ, USA. https://www.merckvetmanual.com/digestive-system/salmonellosis/salmonella-dublin-infection-in-cattle

Salmonella Dublin Risk Management HERD SD app: https://apps.apple.com/us/app/herd-sd/id6748356498