Abstract Background The density of Ixodes ricinus nymphs infected with Anaplasma phagocytophilum is one the parameters that determines risk for humans and domesticated animals to contract anaplasmosis. For this, I. larvae need take a bloodmeal from free-ranging ungulates, which are competent hosts A. phagocytophilum. Methods Here, we compared contribution four ungulate species, red deer ( Cervu...