PARTNER FEATURE ▶▶▶
Controlling Gumboro consistently
As Gumboro is a resident disease on many farms, keeping the virus at bay is essential. With good biosecurity between houses, thorough cleaning and disinfection, improving the overall health status of the bird and, last but not least, vaccination, infectious bursal disease (IBD) can be consistently controlled.
BY MARCO AURÉLIO ELMER LOPES, CEVA W
A sound Gumboro disease vaccina- tion programme should aim to break the Gum- boro cycle. Such a vaccination pro- gramme should be designed to stop the spread of IBD.
36 ▶ POULTRY WORLD | No. 4, 2021
hen poultry producers consider their Gum- boro disease control schemes, some ques- tions may come to mind. The most important being: how can Gumboro be consistently con-
trolled throughout the year? And – diving deeper into the pathway of infections – why is it so important to block the broilers’ bursa with a live vaccine? To answer these questions it is important understand the dynamics of the Gumboro dis- ease virus. As a resident disease, the virus is already present inside the farm, mainly in the litter but also in the house itself. When the newly arrived day-old chicks are released onto the floor, their exposure risk to the virus is very high. The charac- teristics of this challenge (age, severity, consequences, etc.)
will vary from one poultry house to another but the disease challenge will definitely occur. An IBD virus challenge may not necessarily cause an immedi- ately perceptible adverse effect but it will create the opportu- nity for the field virus to multiply, naturally produce variants and spread. This has two very important consequences that will impair future sanitary conditions and the economic per- formance of the poultry house or farm. The first of these is that it will increase virus pressure and consequently the amount of virus which the chickens in the next cycle will be exposed to, and the second is that an opportunity will be created for a variant virus to colonise the farm.
Vaccination programme The objectives of a Gumboro vaccination programme must be to provide the chickens with continuous protection against infection with the farm IBDV and it has to be effective from delivery of the day-old chicks until their departure to the slaughtering plant. Good viral protection means that the chickens should be protected against the clinical effects of in- fection (clinical protection) and prevent or significantly re- duce the amount of virus shed after challenge (protection against shedding). That is why it is so important to block the bursa with a live vaccine. Only by blocking the bursa can the
ILLUSTRATION: CEVA PHOTO: STEPHANE KLEIN
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