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Table 1 Prevalence and intensity of Giardia duodenalis cysts in fecal samples from beef cattle located on 22 feedlots from central and western United States.

From: Giardia duodenalis in feedlot cattle from the central and western United States

State/Month of sampling Feedlot prevalence1 (sample size) Range of prevalence by pen2 Range of intensity of fecal shedding by pen2 (cysts/g feces)
Texas    
   January 9.3 (226) 0.0 -- 33.3 0 -- 31,960
   April 5.4 (242) 0.0 -- 8.3 0 -- 3,513
   September 11.0 (236) 0.0 -- 16.7 0 -- 15,429
Oklahoma    
   January 23.8 (240) 1.7 -- 56.7 46 -- 26,955
   May 21.7 (240) 11.7 -- 36.7 436 -- 51,430
   January 14.6 (239) 0.0 -- 31.7 0 -- 2,089
California    
   August 16.7 (245) 13.3 -- 20.0 4,519 -- 58,663
   February 20.0 (240) 10.0 -- 38.3 298 -- 5,166
   September 7.5 (240) 3.3 -- 11.7 390 -- 3,605
   January 6.4 (235) 3.4 - 13.3 47 -- 16,141
Washington    
   October 34.2 (240) 25.0 -- 52.5 1,722 -- 261,710
Colorado    
   September 20.4 (240) 11.7 -- 33.3 1,079 -- 219,406
   March 30.9 (236) 20.0 -- 45.0 1,446 -- 7,783
   July 13.9 (244) 8.3 -- 16.9 184 -- 22,298
   January 18.8 (240) 5.0 -- 45.0 115 -- 22,248
Nebraska    
   November 25.0 (240) 3.3 -- 63.3 161 -- 144,327
   April 19.5 (236) 8.3 -- 30.0 941 -- 7,278
   September 12.2 (238) 0.0 -- 25.0 0 -- 39,698
South Dakota    
   August 23.3 (240) 11.7 -- 38.3 918 -- 10,952
   March 43.6 (243) 26.7 -- 55.0 3,306 -- 7,026
   July 25.8 (240) 21.7 -- 28.3 689 -- 2,112
   January 15.8 (240) 10.0 -- 16.7 276 -- 1,515
Overall total 19.1 (5,260)   
  1. 1 Fecal samples from each feedlot were collected from two to six pens of cattle, stratified by time on feed (entry, middle, exit)
  2. 2 Prevalence of fecal samples with Giardia duodenalis cysts and their mean intensity (cysts/g feces) calculated at the level of pen