TABLE 3.

Microscopic counts of viable and modified oocysts in confirmation and trip controls

Sample setNo. of viable oocystsNo. of modified oocysts
Initial counts at USEPA (group A)aConfirmation controls counted at UNC (group B)bTrip controls from USGS to USEPA counted at USEPA (group C)eTrip controls from USGS to UNC to USEPA counted at USEPA (group D)Confirmation counts at UNC (group E)
19794949780d
29891979489
39588989397
498101999792
59397989296
69488949293
79792929489
89653c908851c
99490ND8896
1093901009398
119494919184
129588929490
139694989494
149688879090
Avg95.491.994.692.692.3
SD1.74.04.02.84.1
  • a Each value is the mean of three counts done by the same analyst.

  • b Each value is the mean of two counts done by the same analyst.

  • c Slide did not stain well, so counts are underestimated; this value was not used in average and statistical analyses.

  • d Slide had air bubbles, so counts are underestimated; this value was not used in average and statistical analyses.

  • e ND, not determined.