Table 4

Ctenocephalides felis adulticide efficacy.

n cats Arithmetic means (AM) of live fleas and % efficacy on indicated days
Study #1 Day 1 Day 7 Day 14 Day 21 Day 28 Day 35 Day 42 Day 49 Day 56
 Control group 9 AM 74.2 74.0 82.2 69.3 57.6 66.9 63.7 60.4 69.4
 Treated group 9 AM 0.2 0.0 0.0 0.0 0.1 0.2 0.2 1.9 7.9
% efficacy 99.7 100.0 100.0 100.0 99.8 99.7 99.7 96.9 88.6
Study #2 Day 1 Day 8 Day 15 Day 22 Day 31
 Control group 10 AM 68.2 74.7 68.8 77.2 73.0
 Treated group 10 AM 5.4 0.1 0.0 0.4 3.3
% efficacy 92.1 99.9 100.0 99.5 95.5
Study #4 Day 1 Day 7 Day 14 Day 21 Day 31 Day 38
 Control group 10 AM 64.5 69.6 69.5 72.1 62.4 49.2
 Treated group 10 AM 1.1 0.0 0.3 0.3 0.7 4.8
% efficacy 98.3 100.0 99.6 99.6 98.9 90.2

Note: p-values for comparison of the untreated and treated groups were <0.0001 at all timepoints.

The percent efficacy was calculated as [(C − T)/C] × 100, where C was the arithmetic mean of the flea counts among the placebo control cats, and T was the arithmetic mean among the Nexgard® Combo-treated cats.

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