Ceva’s New Generation Vectormune®AI Vaccine Proves to be a Useful Tool to Control HPAI24 June 2015
FRANCE - A paper recently published in the peer-reviewed journal Vaccine reports that Ceva’s new generation vaccine, Vectormune®AI, offers significant advantages over previously available vaccines against highly pathogenic avian influenza (HPAI).
The authors conclude that, combined with effective biosecurity measures and monitoring, Vectormune®AI is a useful tool to control different types of HPAI of the H5 serotype in chickens.
Previously, most avian influenza vaccines have been crude inactivated whole virus vaccines. These vaccines provide good protection only against virus types that are identical to those used to make the vaccine.
They can also be rendered ineffective in the presence of maternally derived antibodies (MDAs), which are transferred from the vaccinated hen to the embryo and can persist in chicks for up to 4 weeks.
In contrast, Ceva’s Vectormune®AI is a vector vaccine. It is based on a well-known and safe turkey herpes virus (Marek’s HVT), which has been modified to carry the H5 type hemagglutinin antigen, the key protective factor against the avian influenza virus, which is the key protective factor. The result of the described modification is that this vaccine produces solid immunity against AI viruses of the H5 serotype.
Protection of the vaccinated bird is due to induction of neutralizing antibodies directed against the hemagglutinin as well as stimulation of a cellular immune response, which is not present when classical inactivated vaccines are used.
This explains the high efficacy of the vaccine as well as its broad spectrum of protection against all AI virus strains of the H5 serotype that have so far been tested.
Vectormune®AI is also effective in the presence of MDAs. It can therefore be effectively administered to day-old chicks at the hatchery. This eliminates problems associated with the variable quality of vaccine administration on the farm and provides life-long protection.
Avian influenza is considered to be one of the most detrimental diseases of poultry that can also, under particular conditions, be transmitted from birds to people.
Since 2003, the H5N1 strain of the disease has killed a reported 447 people, while the economic impact of the disease runs into billions with hundreds of millions of birds having been culled worldwide.
For more information see Vectormune®AI at www.vectormune-ai.com.
You can view the full paper and author list by clicking here.
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