Other virus infections can trigger AI
Research presented at the EAGLES Symposium in China
this week indicates that avian influenza occasionally occurs in vaccinated
poultry because of co-infection with other immunosuppressive
These findings were supported by experimental data showing that several
immune suppressive viruses have the ability to weaken the immune protection in
vaccinated chickens. With a weakened immune defence, the chickens are vulnerable
to avian flu virus.
This information indicates that current vaccination programmes alone cannot
guarantee control of avian influenza in commercially farmed chickens, because
various immune suppressive viruses are widespread in chicken farms and have the
ability to make the chicken vulnerable to avian flu even after
The professor commented that the prevalence of immunosuppressive virus
infection in chickens is not well known and should be studied in more detail.
There may be a need for a new vaccination strategy targeting a range of viruses
in order to control avian flu, he said.
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