| cryptosporidium parvum oocyst inactivation in field soil and its relation to soil characteristics: analyses using the geographic information systems. | the need exists to understand the environmental parameters that affect inactivation of cryptosporidium parvum oocysts in soil under field conditions. the inactivation of c. parvum oocysts placed in the natural environment was studied at a dairy farm in western new york state, usa. seventy sampling points were arranged in a grid with points 150 m apart using the geographic information system. the sampling points were distributed among three distinct areas: woodland, corn field and pasture. purifi ... | 2004 | 15050384 |