Live vaccines can mutate in the body, creating deadly strains
When combined two vaccines, which are used to prevent the development of infectious diseases in chickens are obtained deadly strains of viruses, according to ABC News. Specialists from the University of Melbourne, who made the discovery, encouraged to review the use of vaccines in poultry. Moreover, a similar situation may occur with any vaccine, including those used in human vaccines.
In this particular case we are talking about the virus ILT (infectious laryngotracheitis), causing the death of the birds. Dr. Joanne Devlin says, if you connect the two live vaccines against the virus, appears deadly strain, characterized by high virulence. Previously, scientists did not observe this.
Professor Ian Gust from the Department of Microbiology and Immunology, University of Melbourne says: experience with avian influenza confirmed the fact that viruses are able to mutate active. In order to reduce the risk of change, you need to be vaccinated when the region is not circulating seasonal flu. For the same reason you can not vaccinate people already infected.