Figure 2

Mean antibody titre (+SD) to Anaplasma phagocytophilum in lambs from two Norwegian sheep breeds, NW and ON, respectively, experimentally infected with a variant of A. phagocytophilum in 2009. Ten lambs in each group were inoculated on day 0 and five lambs were re-challenged with the homologous variant after twelve weeks. A titre below 1:40 (log₁₀ = 1.6) was considered negative. Arrows indicate time of inoculation. ● - NW, ○ - ON, ^b four lambs, Two-sample t test: ^# p < 0.05