Long-Term Control for IBH Includes Vaccines, Management Protocols

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Long-Term Control for IBH Includes Vaccines,
Management Protocols
Inclusion body hepatitis (ibh) remains a nagging
issue for broiler flocks, and it isnt going away
anytime soon. it seems that ibh is a
primary pathogen now, and its presence
seems to be very widespread, suzanne
dougherty, dvm, pilgrims, told fellow
participants of a roundtable ibh managing
an emerging immunosuppressive disease of
broilers. the roundtable, organized by Zoetis
Vaccine, involved poultry-company veterinarians
with firsthand ibh experience and academicians
whove studied the disease. were definitely
still struggling, said sara throne, dvm, simmons
foods. it ibh seems to ebb and flow, and we
havent always found out why.
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Future Vaccine Prospects
Autogenous vaccines to address ibh have proven to
be a valuable tool and will continue to be part
of a long-term control strategy, roundtable
panelists agreed. From our experience,
autogenous vaccination was very effective, and
that was the key for us, said joel cline, dvm,
He credited issues in the
autogenous vaccines for companys north alabama
wayne farms. resolving ibh farms.
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Making efforts to ensure good foundational
immunity can also help reduce the impact of ibh.
This is especially important with ibd,
Optimizing Immunity
according to guillermo zavala, dvm, phd,
avian health international. when it comes to
ibd, this being probably the most important
component in the whole picture of ibh, you
do want to protect the
pullet against ibd, he said. typically, the
industry will use a recombinant vaccine
and/or live-attenuated vaccines for ibd, with
two or three doses given during rearing,
followed by one or two killed vaccinations. In
doing so, you want to make sure your killed
vaccines represent the relevant viruses that
circulate in broilers.
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Ensure Vaccine Coverage
Autogenous vaccines are doing double or even
triple duty today, with farms adding other
viruses into the mix. The volume in that
autogenous-vaccine bottle is becoming more of
a premium, said Holly Sellers, PhD, University
of Georgia Poultry Diagnostics and Research
Center.
Basic serological tools can help evaluate how
the birds are responding to the viruses in
the vaccine, Sellers noted. This can help
you determine if you are getting immunity to
last for the span of time that you need it to.
Even if breakthrough cases are not an
issue, theres merit in periodic surveillance
testing, the roundtable participants said.
Its a way to ensure that the IBH serotype
in the vaccine aligns with the one that birds are
encountering in the field.
This is a
sound strategy, but if the birds response
appears to be declining or broilers from vaccinate
d breeders break, then its time to investigate
further.
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Looking Ahead
However, there remains a void in
serological diagnostics or surveillance testing.
we have elisa kits that detect group 1
adenovirus antibodies, but we dont know what
serotypes the birds are responding to. Is
it serotype 1, 4, 7 or what? zavala
said. The industry needs a tool to sample
birds in the field to determine whether they
are seroconverting against the ibh type
circulating within the flock, zavala noted.
that would be very useful, he concluded.
Zavala endorsed the need for targeted
diagnostics, not just to keep track of the
ibh serotype circulating in a farm or flock but
also to track the predominant serotype
industry- wide. regarding ibh autogenous
vaccines, 8b is the predominant type today.
But we dont know what its going to be 5
years from now, he said. today we have the
molecular tools to do that.
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