We live in medium northern region and we have ticks coming out in spring. We need to vaccinate against viruses it can bring. Not all can be vaccinate. Viruses can be paralitical and even lethal in some cases. It is not obligate, it was till last year for free for childrens. Now parents need to spent big money on vaccination. I have no doubt to vaccinate Aurelia, because it is 99,9% to be safe with it. Do you vaccinate against tick viruses?