Epidemiology and public health importance of bovine salmonellosis

Abstract

Background: Bovine salmonellosis is one of those globally important zoonotic issues, mostly due to Salmonella typhimurium and S. Dublin, and it can lead to diarrhoeal as well as systemic illness in people and animals. Objective: The aim is to look over the latest epidemiological and public health figures for bovine salmonellosis, while thinking about how transmission actually happens, what pathogenic mechanisms are going on, and what therapeutic options exist in practice. Methods: This is a narrative review, based on the available literature about epidemiology, pathophysiology, and the clinical handling of bovine salmonellosis, with a special focus on zoonotic spread and those antimicrobial considerations that often matter a lot. Results: Salmonellae keep hanging around quite broadly in farm waste, sewage, and places that are fecally contaminated, and then they slip into the food chain through livestock having subclinical infections, after that contaminating meat, milk, eggs, and even irrigated produce. Rumen and intestinal colonisation seems to be helped along by three major disruptions to the usual microbial “brakes”: starvation or just reduced feed intake, a higher abomasal pH coming from some feeding approaches, and antibiotic-induced depletion of the intestinal microflora that usually competes. The harmful invasion then happens when the bacteria latch on and infiltrate the columnar cells and microfold, (M) enterocytes in the mucosa, mainly around Peyer’s patches in the terminal jejunum, and ileum. For humans clinically, non-typhoidal salmonellosis is mostly self-limiting; using routine antibiotics is discouraged because it doesn’t really shorten the illness, and it doesn’t lower fever either. Instead, it can extend gastrointestinal carriage and set the stage for relapse, so antibiotics are kept for severe or systemic disease cases only. Conclusion: effective control of bovine salmonellosis seems to need science-based herd management, strict food hygiene measures and careful antimicrobial stewardship, otherwise it can get out of hand. At the same time public health education about how transmission happens, and why hygiene compliance matters, stays pretty central for lowering the zoonotic burden that comes with this pathogen.