I have not seen anything on the vet boards about parvo outbreaks, just an HGE like disease in Ohio and influenza on the east coast.
Parvo always tends to spike during the summer, lots of puppies and warm weather leads to increased incidence.
I'm not aware of any strains that are not addressed by the vaccines available now, so it is important to have up to date protection for everyone, especially those of us who travel and may have exposure to places like rest areas.
As far as vaccination schedules, the AVMA/AAHA guidelines now recommend every three years for core vaccines (Rabies, Distemper, adenovirus and Parvo) then all the others on an as needed/risk assessment basis. Most of our clients still opt for the annual rabies vaccination but do the three year interval for the distemper/parvo. This is what I do for our dogs (including the 3 yr rabies) and feel comfortable with this protocol.
I wouldn't hesitate to travel to AZ or any other part of the country.
There is a pretty short incubation period for parvo (several days to a week or two at most). If proper isolation and quarantine procedures as well as disinfection of transport vehicles are in effect, there should be no problem with shelter transport.
Doug, DVM