On the news last night I was shocked to found out the park I walk in three to fours days a week had an out break of parvo virus

They had discovered a dead fox and once tested it came back positive for the virus.
Kez is up to date and fully vacinated but this still concerns me as after arriving back today there are signs everywhere warning us about it.
Your advise needed
1 - What are the chances of a vacinated dog contracting the virus
2 - Would you avoid the enviroment for a while
Thanks