Dear Mr. Salehi
Your follow-up and accuracy is appreciated
But this problem has also been seen in vaccinated herds
In addition, vaccination was done in many herds after the symptoms appeared, which had no effect
Of course, I said that I personally do not agree with the initial origin of Newcastle as the cause of nerve damage and grounding
At least as you said, the case of your collection was treated with antibiotic therapy, which you know, antibiotics are ineffective against viruses, and it shows that your case was a bacterial infection, not a viral one.
Besides, we have slaughtered and dissected the newly landed birds many times and we did not see any macroscopic signs of bacterial, viral and fungal infection on the carcasses.
(The last case was last night in the slaughterhouse of a friend)
I must point out that the chronicity of the condition and weakness caused by malnutrition gradually leads to a decrease in the bird’s immune system and an increase in the possibility of infection with all kinds of bacterial and viral infections (which a healthy and normal bird in the same environment does not get infected with).
Therefore, if you send a blood sample to the laboratory from a chicken that has been grounded for about 10 days, there is a possibility that it will be Newcastle positive, but this is not the main reason for its being grounded.
This post is written by Shahraeeny