Joan Shields list of "references" points out a big problem with the
literature on Giardia and Cryptosporidium. Finding Cryptosporidium
oocysts or Giardia cysts in water does not demonstrate that these are
infectious to humans. Unless molecular characterizartions are done that
can implicate human strains of the parasites are present, then the
"finding" of these oocysts/cysts in water samples is virtually
meaningless.
