Gerry Walton
Perfect timing! Just had my two 3-year old Westies titer test (VacciCheck). One Westie tested positive for parvo and distemper. The other Westie, parvo was positive but distemper was negative. I asked about the negative reading and they said it was just light blue instead of bright blue. Of course, they are advocating re-vaccinating for distemper. My gut tells me no, and now your article confirms it. This Westie also receives weekly allergy shots for his 20+ environmentally allergies. No sure if there's a corrolation between the allergy therapy and the negative titer.