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Incidence and prevalence of microbial indicators and pathogens in ovine faeces in New Zealand


The incidence and prevalence of micro-organisms in ovine faeces as potential sources of diffuse pollution to natural waters were determined. Faecal samples from lambs at slaughter (N=105) and sheep at pasture (N=220) were collected. E. coli, enterococci and Campylobacter spp. were enumerated in lambs (6.04×108, 1.44×107 and 3.3×105 g−1 respectively) and sheep (1.62×107, 6.8×105 and 2.08×103 g-1 respectively). Campylobacter spp., Salmonella spp. and Shiga toxin producing E. coli (STEC) were present in 80.9%, 1.9% and 3.8% of lamb samples, and 30.4%, 0% and 0.9% of sheep samples respectively. Cryptosporidium spp. and Giardia spp. were present in 28.6% and 37.1% of the lamb faecal samples, and 3.6% of sheep samples were positive for Cryptosporidium spp. The results of this study will be incorporated into models for estimating the potential impact of ovine faeces on natural waters.

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