FURTHER INVESTIGATIONS HAVE HIGHLIGHTED THE FACTS THAT:
These limitations explain why it is really not uncommon to discover unprotected flocks in endemic countries and why severe clinical outbreaks are often reported, despite “good vaccination” practices.
So far, the general opinion in the poultry industry was that ND would stay for long in most ND endemic countries and that is why vaccination was, at best, considered as an aid to maintain poultry production, but definitely far from being an effective tool of an eradication program.
On the other hand, in low challenge countries, the uncontrolled circulation of lentogenic (vaccine) strain was regarded as an issue, since it was frequently responsible for bacterial opportunistic secondary infections leading to extra antibiotic use and to higher condemnation rates due to airsacculitis.
This was the situation when Ceva launched Vectormune® ND in 2013.