Which test serves as a good indicator of protection against canine parvovirus and can evaluate response to vaccination?

Which test serves as a good indicator of protection against canine parvovirus and can evaluate response to vaccination?

• A. Serum antibody ELISA or Hemagglutination Inhibition (HI)
• B. PCR for parvovirus DNA
• C. IDEXX fecal panel
• D. ELISA for IgM

Answer: (A)

Protective immunity against canine parvovirus is best inferred by measuring circulating antibodies that neutralize the virus. Vaccination aims to generate these neutralizing antibodies, and their presence at adequate levels correlates with protection. Serum antibody testing, such as an ELISA that quantifies CPV-specific antibodies, directly estimates the amount of protective antibody in circulation. The hemagglutination inhibition test adds a functional readout by showing how well those antibodies prevent the virus from agglutinating red blood cells, which mirrors neutralizing activity and protection. Other tests don’t reflect vaccine-induced protection as well. PCR for parvovirus DNA detects active infection, not immune status. A fecal panel screens for various pathogens in stool, not the host’s immune protection. An IgM ELISA signals a recent infection, not the durable, protective immunity developed after vaccination.

Protective immunity against canine parvovirus is best inferred by measuring circulating antibodies that neutralize the virus. Vaccination aims to generate these neutralizing antibodies, and their presence at adequate levels correlates with protection.

Serum antibody testing, such as an ELISA that quantifies CPV-specific antibodies, directly estimates the amount of protective antibody in circulation. The hemagglutination inhibition test adds a functional readout by showing how well those antibodies prevent the virus from agglutinating red blood cells, which mirrors neutralizing activity and protection.

Other tests don’t reflect vaccine-induced protection as well. PCR for parvovirus DNA detects active infection, not immune status. A fecal panel screens for various pathogens in stool, not the host’s immune protection. An IgM ELISA signals a recent infection, not the durable, protective immunity developed after vaccination.