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#104707 - 07/13/12 03:57 AM Something to be aware of
Foehn Offline
Lord of the Fowl

Registered: 08/08/06
Posts: 1974
Loc: New Zealand
New virus strain

Especially for our Australian members, but this has the potential to spread Internationally

#104733 - 07/13/12 02:21 PM Re: Something to be aware of [Re: Foehn]
Wieslaw Offline
Classroom Professor

Registered: 09/18/09
Posts: 3824
Loc: Denmark

#104739 - 07/13/12 10:05 PM Re: Something to be aware of [Re: Wieslaw]
KazJaps Offline
Classroom Professor

Registered: 08/30/02
Posts: 2864
Loc: Australia
Always has been a problem using live ILT vaccines, with the known risk of vaccine strains mutating back to a virulent form, let alone mixing with wild-strains or multiple vaccine strains. They really should not be used unless a significant risk of flock contact with ILT wild-strains, especially not suited in small backyard flocks where there isn't an all-in/all-out husbandry system (ie small flocks: mixing of vaccinated/un-vaccinated, possible wild-strain carriers, different ages, birds live much longer & can be carriers for life, longer life of live ILT vaccinated birds also allowing more opportunities for vaccine strains to evolve, etc).

See the sad history in North America, with the problems of live ILT vaccinated backyard/small flocks being quarantined, etc. Thankfully new killed ILT vaccines were introduced there.

Live ILT vaccines have the same problem as Mareks (both herpes viruses) - they don't eradicate the virus from flocks, remain carriers, & even worse live ILT vaccine viruses known to mutate. Therefore live ILT vaccinated flocks should not be mixed with unvaccinated. How impractical is that with backyard/exhibition flocks. We haven't had a choice of killed ILT vaccines in Australia.


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