WATT PoultryUSA - October 2015 - 34

POULTRY
H E A LT H
TODAY

INNOVATIONS AND PRAC TIC AL ADVICE FOR SUCCESSFUL FLOCK C ARE

PROGRAM

A

USING A RECOMBINANT FOR

IBD

"

IBD control begins with the broiler-breeder that shares passive
immunity with the broiler. You want the vaccine to match the
field challenge as closely as possible.

When to consider it
Recombinant IBD vaccines are usually the first choice when
ILT, ND and infectious bronchitis virus (IBV) pressure is low and
growers are faced with a high - or early - IBD challenge.
Winter and spring are peak challenge times for IBD due to
lower temperatures and reduced ventilation, which increases
the concentration of the virus and field challenge over time.
The recombinant IBD vaccine has been demonstrated to be
highly effective on many farms. However, growers must
remember that continuous use of a recombinant IBD vaccine
only buffers the challenge from the field virus. The viral load
and production losses will usually decrease, but the virus
continues to replicate, Cookson says. "That allows reinfection
in the next cycle of birds and the possible selection of more 'fit'
subpopulations over time," he adds.
Managing maternal antibodies plays a key role in any
effective IBD-control program. "IBD control begins with the
broiler-breeder that shares passive immunity with the broiler,"
Cookson says. "You want the vaccine to match the field
challenge as closely as possible."

KALEN COOKSON, DVM, MAM

However, the gold standard for ILT control, particularly in large
birds, is the modified-live, chicken-embryo origin (CEO) vaccine.
A CEO vaccine can produce a "sterilizing immunity" against the
ILT virus and helps break the challenge cycle, Cookson explains.
At the same time, however, the CEO vaccine has the potential
to spread the disease to unvaccinated birds. Strict biosecurity
helps reduce the spread of ILT between vaccinated and
unvaccinated barns.
Farms planning to begin a CEO vaccination program should
increase biosecurity measures, share plans with neighboring
farms and encourage collaboration on vaccination programs.

Options for managing ND
Without a recombinant ND vaccine in the mix, producers must
select more traditional ND vaccines, based on disease pressure
and history. Available vaccines vary from the nonreactive C2
through the less-attenuated B1 strains.

IBD

Options for managing ILT

If an HVT-based recombinant vaccine is being used for IBD,
there are two options for managing ILT. One is a fowlpox virus
(FPV)-based recombinant for ILT, which can be used without
fear of replication competition.

"

During winter months, many operations choose to use a C2
vaccine - one that limits reactivity and helps growers avoid
putting additional stress on the birds, Cookson says. However,
using C2 year-round allows field-virus levels to build -
eventually making C2 less effective, particularly against a late
NDV challenge.
Cookson recommends "moving up the reactivity/efficacy scale"
during summer with a vaccine such as PoulvacĀ® Aero ND. "That
approach will help to decrease circulating virus levels and help
prevent late-season challenge," he explains.



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