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Table 1 Mean and standard deviation (± SD) of different clinical variables in 5-month-old lambs of two Norwegian Sheep breeds, Norwegian White (NW) and Old Norse (ON), respectively, infected with one variant of A. phagocytophilum

From: A comparative study of clinical manifestations, haematological and serological responses after experimental infection with Anaplasma phagocytophilum in two Norwegian sheep breeds

  2008 2009
  NW ON P-value NW ON # P-value
Incubation period (days) 3.0 ± 0.0 2.9 ± 0.3 ns 3.0 ± 0.0 9.6 ± 2.4 p < 0.0001
Max. temp. (°C) 41.87 ± 0.18 41.64 ± 0.11 ns 41.86 ± 0.13 40.96 ± 0.54 p < 0.001
Duration of fever (days) 8.9 ± 2.77 5.6 ± 1.02 p < 0.01 8.0 ± 3.07 5.4 ± 3.11 Ns
Magnitude of fever (mm 2 ) 912 ± 158 503 ± 89 p < 0.001 737 ± 231 275 ± 174 p < 0.001
Nadir of neutropenia (<0.7 × 10 9 litre -1 ) 0.22 ± 0.06 0.22 ± 0.08 ns 0.26 ± 0.10 0.28 ± 0.15 Ns
Duration of neutropenia (days) 9.1 ± 2.38 10.1 ± 2.21 ns 6.7 ± 2.24 5.7 ± 2.49 Ns
Max. infection rate (%) 49.0 ± 3.46 44.6 ± 5.66 ns 52.9 ± 1.79 46.6 ± 9.76 Ns
Weight loss (%) a - 10.7 ± 3.21 -9.5 ± 4.63 ns -9.6 ± 2.81 1.4 ± 4.20 p < 0.001
  1. a weight loss was measured one week after inoculation; ns - not significant
  2. # only seven lambs were infected
  3. The study was performed in two subsequent years, 2008 and 2009, respectively. Ten lambs in each group were inoculated. A two-sample t test was used for statistical analysis