I get my pups out fast. But prior to this, i will check with the vet if any parvo is around plus other risks; blue green algae etc. If it is, then i socialise in 'clean' areas, such as vaccinated mates dogs in gardens etc till fully vaccinated.
Vaccination: there is more to this than your average punter understands. There are strong arguments against vaccinations. There are strong arguments for. For my human family, we dont vaccinate. For my dogs, i will vaccinate.
I do gradient exposure in children of mine. And all have immunity to the illness that we vaccinate humans to. As a migrant, i was not allowed to enter my children in ausssie school without vaccination. So we got the immunology tests done to prove, no need. Still schools would not let them enter, based on a head teachers medical understanding of immunisation. Whatever, i then lied, falsified a certificate, and educated them.