Gylter (hundyr, der endnu ikke har faret) skal have tre injektioner, mens søer (dyr, der tidligere har faret) skal have to injektioner, og tidligere vaccinerede søer behøver kun én injektion.
The number of injections needed varies according to the type of female pig being treated: gilts (female pigs that have not yet had piglets) need to receive three injections; sows (female pigs that have had piglets before) need to receive two injections; and sows that have been vaccinated before need only one injection.