For Cryptosporidium, r has been estimated
to be 0.0040, and for Giardia, r has been
estimated to be 0.0199 (Teunis et al.,
1996). Using these values, the dose–
response relationship can be characterised
and is shown in Figs. 1 and 2, along with
the published feeding trial data from which
these dose–response relationships were
generated