February 1, 2019

To manage IBDV, ‘let the bird tell you what to do’

Conventional wisdom dictates that infectious bursal disease virus (IBDV) field strains should determine the vaccine strategy.

However, a recent study from Brazil indicates the reverse is also true: The vaccine strategy can influence which IBDV field strains appear – and understanding and monitoring these dynamics are critical to the long-term control of the disease.1

The 4-year study, published in The Journal of Applied Poultry Research, looked at bursal tissue samples from IBDV-positive commercial broiler flocks in Brazil that had been immunized using one of three different IBDV vaccine strategies: a turkey-herpesvirus vectored IBD vaccine, an antigen-antibody complex vaccine or a conventional live vaccine. While half the IBDV-positive samples were compatible with vaccine genotypes (classic IBDV), as expected, the other half were classified as variant or very virulent field strains.  Read more

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