Risk assessment for Cryptosporidium parvum in reclaimed water

The risk of cryptosporidiosis associated with San Francisco's proposed wate r reclamation program is conservatively estimated using an exponential dose -response model based on human infectivity data for Cryptosporidium parvum. The observed C. parvum concentrations in filtered secondary effluent prese nt less than a 1-in-10,000 annual risk of contracting the water-borne disea se through regular exposure at parks and golf courses irrigated with tertia ry reclaimed water in San Francisco. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.