Field Efficacy of an Attenuated Infectious Bronchitis Variant 2 Virus Vaccine in Commercial Broiler Chickens
A very sensitive and makes a diferent about how we should get our vaccines and tge tyoe according to climate and conditions over this ..plus had seen the boosting of tge vaccines but there are also some areas that drs are not taking on a conscience on this by doing as mentioned and have a detemined vaccines for the area.
Challenge are being seen and heads on to attain the resolution by taking time and make sure they come up with the correct vaccine. Thank so much had learnt and i suggest if all dr under vets should address this each and every region so that the selking of and ibv ot hypravia clone or NCD vaccines should be the right ones and proper administered to birds.
Regards,
Daniel.
daniel severino Thanks for your nice comments.
For sure, each region should evaluate the proper prime-boost vaccine strategy and choice the proper vaccines type for IBV according to the epidemiology of the region to obtain the proper protection.
Thank you for this self-explanatory work. In our breeder farm, we observed that Infectious bronchitis is endemic. At some point, we stock commercial broiler in some of our pen houses and sprayed them with IB4/91 at first week. We started experiencing facial swelling, sinusitis with respiratory distress and of course mild mortalities for like 2 batches. We removed the IB4/91 from the vaccination program for the 3rd batch and there was no sign of IB diseases on the farm.
Does it mean that IB4/91 vaccination done for the commercial broiler stocked for the first 2 batches failed or the birds had already been exposed to the field strain before the vaccination?
Akintunde Akintoye, greetings.
Maybe the flocks sprayed with IB-4/91 had a bacterial infection and this vaccine its residual pathogenicity higher Classic IB vaccines, so it was a postvaccinal reaction complicated with bacteria.
It's not preferable to use 4/91 in the first few days of life; if you are using prime-boost strategy; use it as a second dose; if it required in your area and match circulating virus, if not remove it from the vaccination program.
Regards,
Wael.
Wael Elfeil, greetings. thank you very much for your contribution. Just like you said, the vaccine strain isn't meant for priming. We have completely removed the vaccine from the vaccination program.
Akintunde Akintoye
Dear sir first thank you for your message. Usually using 4/91 at first week when u have early IB challenge otherwise 2nd weeks is the recommended time.
When u get post vaccination after using it, u need to be sure that you give it as coarse spray.
Can you please let me know when you give it and what is the method?
abid ali better not to use as prime vaccine even if it is coarse spray, this is my experience science long time.
Well, but is it possible mutation in present situation though by applying vaccine starin H 120 strain its available in market but bacterial growth is controlled still mortality moves up waiting yr honourable opinion.
1. It is not possible To completely exclude the 793B group of vaccines from the priming of broilers for a day. You need to use for example (at 1day) Ibird793b+Mass. In the future (11-14 days) if you want to strengthen (increase strategy) 4/91+Mas(Ma 5). 2. H120-unfortunately loses its relevance. The reason is the deterioration of epizootics according to IBV
Thanks Dear for valuable guidance. I have observed that poultry Farmers instead of working on bio security & other health management in long lived birds like commercial layer birds, give Live IB vaccines of both classic & variant types with the interval of 30 to 50 days. Only one type of vaccine is used at one time & is usually Massachusetts type but variant (usually 4/91 mostly is given as variant) after long intervals in comparison to Massachusetts.In my opinion it is more damaging due to nature of virus (Corona type) as it generates new variants or recombination of viruses for IB.
Please guide about the interval for IB live vaccine repeat gap. Request is for all participants please
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