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Salmonella Dublin, a group D Salmonella in the White-Kaufmann-Le Minor classification scheme that expresses ‘O’ antigens 1, 9 and 12 and usually phase 1 H antigens g and p, is generally considered to be a cattle-adapted strain, and is a recognised cause of septicaemia, enterocolitis and abortion in this species (Hinton 1977, Jones and others 2004). It accounted for 72.1 per cent of diagnoses of cattle salmonellosis in the UK in a recent study, and is more likely to be associated with abortion than other common cattle serovars, including Salmonella Typhimurium, which is the second most frequent serovar (Carrique-Mas and others 2010). This short communication describes bovine abortion associated with a non-motile group D Salmonella, which, as has been previously suggested for similar isolates from Europe (Franklin and others 1990) and the USA (Selander and others 1992), and by some molecular evidence in this report, may be a variant of S Dublin.
In August 2010, a bovine fetus of approximately 235 days' gestation, from a 250-cow Holstein-Friesian dairy herd in North Yorkshire, was submitted to Animal Health and Veterinary Laboratories Agency – Thirsk, to investigate the cause of abortion. Gross examination of the fetus revealed fibrinous pleuritis and pericarditis. A non-motile Salmonella 9,12:-:- strain was cultured from the fetal stomach contents (FSCs) using Brilliant Green agar (BGA) (Oxoid) after pre-enrichment in selenite broth (Oxoid) with aerobic incubation at 37°C. No other cause of bovine abortion was identified. One week later, a second aborted fetus of approximately 130 days' gestation, from a dam that was reported to be showing diarrhoea, was submitted by the same farm for postmortem examination. Autolysis precluded meaningful gross postmortem examination, but Salmonella 9,12:-:- was cultured …