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Monitoring field strains key to successful vaccination against IBDV

Daral Jackwood

More than 60 years of research and experience have made it clear that infectious bursal disease (IBD) in broilers is here to stay, and that unless it’s managed, considerable losses can occur, according to Daral Jackwood, PhD, professor at The Ohio State University. In an article written for Poultry Health Today, Jackwood said vaccines are the best tool we have to combat infectious bursal disease virus (IBDV), but too often success is only marginal unless we understand the evolving nature of this pathogen, monitor carefully for changes and adjust the vaccine protocol accordingly.




Marek’s disease vaccination needed now more than ever

Kalen Cookson

Relaxing Marek's disease (MD) vaccination programs could badly backfire on producers reconsidering the value of protecting birds against the disease, according to Guillermo Zavala, DVM, PhD, president, Avian Health International. In an article written for Poultry Health Today, Zavala said MD rates are currently low because the industry has been vaccinating consistently for almost 50 years. Any interruption to that process would cause those figures to “progressively deteriorate.”



IBD control in egg layers has unique challenges


Controlling infectious bursal disease (IBD) in poultry is always challenging, but it’s especially so in layer pullets. Daral Jackwood, PhD, an expert on the disease at The Ohio State University, says the pathogenicity of IBD virus strains is generally greater in pullets than in broilers. “Not only are morbidity and mortality higher, but damage to the bursa and resulting immune suppression are more severe in pullets compared to broilers,” he writes in Poultry Health Today.




Pathways to protection: How one vaccine decision can affect options for managing other diseases in broilers

Broiler operations naturally want to provide the best disease protection for the least cost but deciding which vaccines to use and when can be a daunting task. Poultry Health Today asked two experts with extensive experience evaluating vaccination programs on hundreds of farms — Kalen Cookson, DVM, MAM, and Lloyd Keck, DVM, ACPV — for help in navigating the path to sensible, strategic, and cost-effective disease protection.



Robust challenge studies demonstrate efficacy of recombinant vector vaccine for IBDVs

A new recombinant vector vaccine provides early protection against variant, classic and very virulent infectious bursal disease viruses (IBDVs), robust challenge studies demonstrate. “Poulvac® Procerta™ HVT-IBD provides an updated tool for protecting flocks against the strains of IBDV circulating among US broilers flocks, including the predominant AL2 variant,” according to Angela Hartman, PhD, Zoetis.