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. 2013 Apr 20;197(1):104–112. doi: 10.1016/j.vetpar.2013.04.022

Table 6.

Regression analysis to determine the ID50 for fecal oocyst shedding, diarrhea, and fecal oocyst shedding with diarrhea in calves experimentally challenged with C. parvum oocysts.

Factor SE P-value R2 ID50 (oocysts)
Shedding
 Intercept 114 9.5 <0.0001 0.45 5.8
 Regression coefficient −48.8 22.0 0.07
Diarrhea
 Intercept 118.2 7.6 <0.0001 0.71 9.7
 Regression coefficient −67.4 17.5 0.009
Shedding and diarrhea
 Intercept 125.2 11.2 <0.0001 0.67 16.6
 Regression coefficient −91.8 26.1 0.01