TABLE 1.

Summary of the duck species sampled and the numbers of ducks positive for (oo)cysts

SpeciesCommon nameNo. sampledNo. positive for oocystsaNo. posi-tive for cystsa
Anas discors Blue-winged teal421
Anas cercca carolinensis Green-winged teal630
Anas platyrhynchos Mallard512313
Anas americana American widgeon332
Anas acuta Northern pintail101
Lophodytes cucullatus Hooded merganser110
Mergus merganser Common merganser321
  • a Some ducks were positive for both Cryptosporidium and Giardia.