Is the infrasound emitted by moving wind turbines harmful to humans or animals?

Weak or none. If it is, the effect is weak. The only good recent review (the book is anecdote, militant activism and sub-science) is in j laryngol march '13; these folks simply concluded we cannot rule out an effect on the ear even though it's not been demonstrated to take place. Science is cutthroat and if there were a major real effect, one of the nih research piranhas would have demonstrated it by now.