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As limited by the available data, human antibody levels (x) for E. coli and norovirus in the general population were determined as the recommended values for the anti-cryptosporidium antibody level investigated in a previous study by analyzing the serum banks (Teunis et al. 2002). The average age of the exposed population (y) was determined as 40 years old, according to field investigation within the region of Lake Cui. Other parameters such as a and b were suggested by a previous study on cryptosporidium dose–response relation (Teunis et al. 2002), while WHO recommended values of c and β were used for calculating the DALY, as shown in Table 3.

Table 3

Parameter values for modified dose–infection relationship

ParameterabCkXy
Suggested value 3.56 −53.2 −0.1658 0.04 0.64 40 
ParameterabCkXy
Suggested value 3.56 −53.2 −0.1658 0.04 0.64 40 

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