Evidence of Cryptosporidium transmission between cattle and humans in northern New South Wales

Ng, Josephine Su Yin, Eastwood, Keith, Walker, Belinda, Durrheim, David N., Massey, Peter D., Porigneaux, Philippe, Kemp, Ross, McKinnon, Bob, Laurie, Kate, Miller, David, Bramley, Elizabeth, and Ryan, Una (2012) Evidence of Cryptosporidium transmission between cattle and humans in northern New South Wales. Experimental Parasitology, 130 (4). pp. 437-441.

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Abstract

Cryptosporidium is an enteric parasite of public health significance that causes diarrhoeal illness through faecal oral contamination and via water. Zoonotic transmission is difficult to determine as most species of Cryptosporidium are morphologically identical and can only be differentiated by molecular means. Transmission dynamics of Cryptosporidium in rural populations were investigated through the collection of 196 faecal samples from diarrheic (scouring) calves on 20 farms and 63 faecal samples from humans on 14 of these farms. The overall prevalence of Cryptosporidium in cattle and humans by PCR and sequence analysis of the 18S rRNA was 73.5% (144/196) and 23.8% (15/63), respectively. Three species were identified in cattle; Cryptosporidium parvum, Cryptosporidium bovis and Cryptosporidium ryanae, and from humans, C. parvum and C. bovis. This is only the second report of C. bovis in humans. Subtype analysis at the gp60 locus identified C. parvum subtype IIaA18G3R1 as the most common subtype in calves. Of the seven human C. parvum isolates successfully subtyped, five were IIaA18G3R1, one was IIdA18G2 and one isolate had a mix of IIaA18G3R1 and IIdA19G2. These findings suggest that zoonotic transmission may have occurred but more studies involving extensive sampling of both calves and farm workers are needed for a better understanding of the sources of Cryptosporidium infections in humans from rural areas of Australia.

Item ID: 25964
Item Type: Article (Research - C1)
ISSN: 1090-2449
Keywords: Cryptosporidium, calves, outbreak, humans, genotyping, 18S rRNA, gp60, zoonotic transmission
Date Deposited: 27 Mar 2013 05:20
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1117 Public Health and Health Services > 111799 Public Health and Health Services not elsewhere classified @ 100%
SEO Codes: 92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920499 Public Health (excl. Specific Population Health) not elsewhere classified @ 100%
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