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Table 2 Output of a simulation experiment based on an experiment where treated and non-treated control groups each with 10 dogs are inoculated with 50 L3 per dog, with a mean establishment rate of 50%. Simulation was repeated 1000X, and values represent the percent of times 0, 1, 2, or >2 worms were observed at five different efficacy levels

From: A statistical approach for evaluating the effectiveness of heartworm preventive drugs: what does 100% efficacy really mean?

% of times you will see 0, 1, 2, or >2 worms
Efficacy (%) 0 worms 1 worm 2 worms >2 worms
99.95 88.16 11.07 0.74 0.03
99.5 28.39 35.61 22.45 13.55
99 8.32 20.74 24.90 46.04
98.5 2.6 8.68 16.09 72.63
98 0.72 3.04 8.59 87.65