well i guess i will get to see if titers work as the plumber that just came to my house on wednesday that did not take his shoes off and came today has a dog that was shipped to him from michigan that has PARVO and his dog was in the hospital on Tuesday and Wednesday and just came home yesterday -called vet she said not to worry since titers were fine for them and keep an eye on them for 5-7 days as the incubation period is 5-7 days so will let you know how that all works out