Table 1.

Cryptosporidium genotypes in samples of surface water from various locations

Sample locationVol filtered (liters)Total no. of samplesNo. of positive samplesSpecies and/or genotypes(s)a
Lake Michigan, Linnwood, Wis.50.3–60 80
Lake Michigan, San Benito, Wis.1020
Lake Michigan, Howard, Wis.50.0–63.130
Aurora, Ill.1072 C. parvum human genotype and C. baileyi (1), C. andersoni (1)
Decatur, Ill.1020
Iowa City, Iowa20.8–24.221 C. andersoni (1)
Kansas City, Mo.4.6–10.031 C. andersoni (1)
St. Louis, Mo.1011 C. andersoni (1)
San Benito, Tex. 3.0–10.050
Potomac River, Washington, D.C.1011 C. andersoni (1)
Chesapeake Bay, Choptank River, Cambridge, Md.5032 C. parvum human and bovine genotypes (2)
Chesapeake Bay, Severn River, Annapolis, Md.5033 C. parvum human and bovine genotypes (3)
Chesapeake Bay, mouth of Severn River, Annapolis South, Md.5033 C. parvum human and bovine genotypes (3)
Chesapeake Bay, Miles River, St. Michael's, Md.5033 C. parvum bovine genotype (2),C. parvum human and bovine genotypes (1)
Chesapeake Bay, Wye River, Pintail Point, Md.5033 C. parvumbovine genotype (3)
Chesapeake Bay, St. George's Creek, Lunderburg, Md.5033 C. parvum bovine genotype (3)
Chesapeake Bay, Wicomico River, Mt. Vernon, Md.5032 C. parvum bovine genotype (2)
  • a Numbers in parentheses are numbers of samples positive for each genotype or species.