My sons was bitten(little stratch) by dog 1.8 years ago and he is doing well till now. He did not received ARV vaccination and moreover the status of dog is unknown to me whether dog had virus or not. I didn't observe dog. I am worried that there are few case with rabies symptom shown after so many years. If he received vaccination right now before first sign and symptom appear, will this vaccination effective for 1.8years ago dog bites case. Does the incubation per of kids is faster than adult?