Liafast, it's people like you who will make the poodle stronger. Immune system issues are really important. It's one of the reasons people should consider breeding young unproven females to older, healthy and proven males. An older proven female could be up for trying a young, unproven male.
I have heard of dogs getting parvo even after being vaccinated before. Parvo is getting more resistant. My vet insists on four parvo vaccines, not three, because of it. I do not like over vaccination, but parvo is one I will follow my vets advice on, although I like to do titers for later vaccines.