Monitoring BLV
The first step to effectively managing and reducing BLV is to measure BLV within the herd. Animals can be identified by presence of BLV antibodies and/or BLV viral DNA.
ELISA
- What is being detected? Antibodies specific to BLV
- What type of sample(s) can be used? Milk or Serum/Plasma
- Test result categories: Positive, Negative, Suspect
- What does this tell us? Which cows have been exposed to BLV.
SS1 PCR
- What is being detected? Amount of BLV viral DNA
- What type of sample(s) can be used? Whole Blood*
- Test result categories: High, Moderate, Low, Undetected.
- What does this tell us? How "contagious" a BLV-positive cow is.
*Because BLV infects B-cells, a type of white blood cell, this type of testing can only be done with whole blood collected in a standard EDTA (purple top) tube.
What's the Right Plan for Your Herd?
ELISA, or ELISA + PCR?