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Dear Madam/Sir,
The symptoms of catarrh you are describing could indicate an infection with trichomoniasis, candidiasis and/or herpes virus. Since you have already treated for canker, you and your vet should probably take these two other possibilities into account. Herpes is very common but is a virus so it is hard to treat. You could consider an L-lysine treatment and vaccination if possible.
Kind regards
Dear Sir,
On the hand of the symptoms that you are giving it is not very clear what the problem is. Is there been already an autopsy or a bacterial analysis by your veterinarian. Because it is important to know if there is really an infection and with which bacteria? Could you please give some more details because otherwise it is impossible to make the correct synthese.
It is possible that it is a E-coli infection, but then is has to be gone after treatment with the correct anitbiotic. It could be also a combination of a viral infection like f.e. circovirus in combination with a secundarly bacterial infection like f.e. coli or streptococcus.
Please give some more details.
Best regards
Dear Madam/Sir,
Herpes is very common in pigeons and a lot of pigeons stay carrier of the virus. This doesn't at all have to mean that bird will not perform well, but in cases of immunity weakening this virus can cause some temporary respiratory and/or throat problems. This can happen because of the races, the stress in the baskets, etc... Then it can help to administer L-lysine on the food for one week f.e. This has a blocking effect on the multiplication of the virus and does help clinically, but it is no medication so it can come back when the birds still have a weak immunity or other diseases. Vaccinations can be of help to prevent the disease from breaking through.
Kind regards
Dear Madam/Sir,
Having read your complete story and search for a cause, I'm personally left with one main explanation from my point of view, but I could off course still be wrong. It could also be important to inform us on which kind of samples were sent (droppings, blood,...)?
From my perspective I think of herpes virus being responsible for the symptoms you are seeing. Although it came back negative I would be curious to know from which samples and with what technique herpes virus was investigated. It could be interesting to vaccinate your pigeons for pigeon herpes virus if you can get such a vaccine.
Also it is my experience that vaccinating against paratyphus (salmonella) (in my case always with dead vaccines), has a positive effect on general immunity and so also on immunity for herpes problems. There are a lot of false negative sample tests for salmonella, so coming back negative from a lab doesn't have to mean anything.
Hoping to be of some help.
Kind regards
Dear Sir,
It would be advisable to treat the birds also for trichomoniasis (f.e. with ronidazole 400mg per liter water) and paratyphus (f.e. with enrofloxacine). Were the birds vaccinated for paramyxovirus, herpes and paratyphus? If not it could be wise to do so.
I cannot be sure of a diagnosis without seeing the birds, but there is a good chance by taking care of these diseases your problem will be solved.
The treatments you had to give, accounted only for candidiasis, streptococs and other bacteria (salmonella temporary) and coccidiosis.
Kind regards
Dear Madam/Sir,
These white-yellow spots could be caused by herpes virus, trichomoniasis or candidiasis. These spots could also be harmless sialolites. I would have to see the birds to be sure. Try to let the birds be checked by a vet for trichomoniasis and candida. My suspicion from your story is herpes virus. This is very common in racing birds but difficult to treat.
Kind regards
Dear Madam/Sir,
This symptom indicates strongly for a pigeon herpes virus infection. You should also consider candida, trichomiasis and/or bacterial overgrowth. The scratching is an indication for upper respiratory problem but this could also be related with the herpes virus.
Kind regards
Dear Sir,
Causes of this could be: trichomoniasis, herpes, upper respiratory problems (bacteria like mycoplasma and others), candida infections. Depending on the problem you should give different medication. Try to get a diagnosis with an avian vet. Treatment for trichomonas could be ronidazole, for bacteria antibiotics like spiramycine, linco-spectin,..., for candida nystatin, for herpes there is no effective treatment without losing condition of the birds completely, but I have some results with L-lysine. As a preventive measure I have good results with a high quality colloidal silver solution.
Kind regards