a1 School of Environmental Sciences, University of East Anglia, Norwich, UK
a2 GeoHealth Laboratory, Department of Geography, University of Canterbury, Christchurch, New Zealand
a3 Institute of Environmental Science and Research (ESR) Ltd, Christchurch Science Centre, Christchurch, New Zealand
In New Zealand human cryptosporidiosis demonstrates spring and autumn peaks of incidence with the spring peak being three times greater in magnitude than the autumn peak. The imbalance between the two peaks is notable, and may be associated with the high livestock density in New Zealand. In the summer and autumn the cryptosporidiosis rate was positively associated with temperatures in the current and previous month, highlighting the importance of outdoor recreation to transmission. No associations between spring incidence and weather were found providing little support for the importance of drinking-water pathways. Imported travel cases do not appear to be an important factor in the aetiology of cryptosporidiosis in New Zealand.
(Accepted October 24 2007)
(Online publication December 04 2007)