25/08/2022
Routine canine vaccinations include those against parvovirus, the department added.
Experts were challenged after affected dogs tested negative during the initial screening by veterinarians, the Otsego County shelter and the Clare County animal control director had said.
"While those tests are valuable in the clinical setting, they are not as sensitive as the diagnostic tests we can perform here in the laboratory. We continue to further characterize the virus in hopes of better understanding why those animals were testing negative on screening tests," said Kim Dodd, the director of the veterinary diagnostic laboratory at Michigan State University.
Some of the first samples submitted to Michigan State's veterinary diagnostic laboratory were positive for parvovirus, the lab and the state agriculture department said Monday.
The affected dogs in Otsego County have generally been under 2 years old or elderly, the county shelter said.
"We have not seen any dogs ... die that are PROPERLY vaccinated," the shelter's Facebook post reads.
Canine parvovirus is spread by dog-to-dog contact and contact with contaminated f***s and environments, the veterinary medical association says. It is not contagious to people or other types of animals, the state agriculture department said.
No drug will kill parvovirus in infected dogs, so treatment for that virus focuses on supporting the body's systems -- including by replacing electrolyte, protein and fluid losses -- so the immune system can fight the infection, the veterinary medical association says.
Survival rates for parvovirus "can approach 90%" with proper treatment, though when death happens, it usually occurs 48 to 72 hours after symptoms start, the association says.
CNN's Amy Simonson contributed to this report.