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 | Â | Â | Â |
   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 | Â | Â | Â |
   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 | Â | Â | Â |
   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 | Â | Â | Â |
   October | 34.2 (240) | 25.0 -- 52.5 | 1,722 -- 261,710 |
Colorado | Â | Â | Â |
   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 | Â | Â | Â |
   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 | Â | Â | Â |
   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) | Â | Â |