It would cause tick saliva from causing infection for a lifetime, it matters so you can give a vaccine and not need to upkeep it especially in rural areas. It matters because it will prevent it forever. I think I’m thinking of something that lasts longer, someone mentioned a binding vaccine.

What does at risk of polio mean? I read that polio infections only affect Americans who aren’t vaccinated and touch recently vaccinated baby feces. If you aren’t in that situation you won’t get polio.