Systematic Veterinary Virology

CONTROL AND ERADICATION

• Vaccines: At present both live and inactivated vaccines are used. Live vaccines based on the Massachusetts serotype alone are used now. Live vaccines confer a better local immunity on the respiratory tract and may protect against a wider antigenic spectrum of field strains. While single dose of live vaccine may protect broilers, it may not protect for the life of the layer flock as variant serotype challenge is very high on farms. Further, the use of some live vaccines carries the risk of residual pathogenicity associated with vaccine back-passage in flocks. Inactivated oil emulsion vaccines preceded by a live virus vaccine produce persistent antibody response.
• Strict biosecurity measures and good husbandry practices will minimize the spread of IBV.
• During outbreaks, the virus should be serotyped and vaccine should be altered.
• In areas where there is no IB, use of live vaccine should be minimized.