Wednesday 18 July 2012

Vaccines Backfire: Veterinary Vaccines Found to Combine Into New Infectious Viruses



ScienceDaily (July 12, 2012) — Research from the University of Melbourne has shown that two different vaccine viruses- used simultaneously to control the same condition in chickens- have combined to produce new infectious viruses, prompting early response from Australia's veterinary medicines regulator.

The vaccines were used to control infectious laryngotracheitis (ILT), an acute respiratory disease occurring in chickens worldwide. ILT can have up to 20% mortality rate in some flocks and has a significant economic and welfare impact in the poultry industry.

The research found that when two different ILT vaccine strains were used in the same populations, they combined into two new strains (a process known as recombination), resulting in disease outbreaks.

Neither the ILT virus or the new strains can be transmitted to humans or other animals, and do not pose a food safety risk.

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