Megabacterial Infection

Question To Dr Robert Marshall.

Dear Dr Marshall,

I have seen your articles on the excellent new budgerigar website set up by Gerald Binks. I am hoping you can help me.

I bred three skyblue cocks in 2008. Their sire died at the end of that year and his symptoms were:

• 1. Loss of Weight
• 2. A pulsing in the crop area.

I treated him over a period with tetracycline paste, baytril, megabac and amoxicillin trihydrate. He did not respond and eventually died after 6 months had passed. Now two of his sons have the same weight loss. They are fluffed up and again do not respond to any treatment. They can look fit for a while, but then relapse. There is no nasal discharge. No vomiting, but the faeces are yellowish in colour. Have you any suggestions as to the problem?
(Name and address supplied)

Dr Marshall’s reply:

Weight loss over a prolonged period is consistent with Megabacterial infection. In my book I describe Megabacteria as a secondary disease related to immune suppression. So we have to look for another primary infection which may be a genetic weakness, but more often inherent Polyomavirus infection and / or stress related psittacosis. I would look for the presence of French moult in the stud. Treatment for megabacteria is complicated and requires direct action via crop needle, but the underlying cause has to be identified. Irrespective, the long term approach is to breed away from this line as it is genetically weak.

Fancier’s response:

What do you recommend for treating megabacteria?

Dr Marshall’s reply:

I suggest Fungalin in liquid or tablet form. You need to treat1/4 ml of fungalin liquid with our “Quik Gel”, ER Formula, with a dosage rate of 2.5 mls daily via crop needle for 10 days. After this assess the situation. Often streptococcus is also involved. So an additional antibiotic, e.g. Clavulox liquid 0.1 in the mixture is a help. If good fertility is a problem or patchy, you may have a psittacosis infection which will then be the primary cause and megabacteria the secondary factor because the polyomavirus seems under control.

Fancier’s response:

I have now obtained the fungalin, but in tablet form. How do I mix this prior to inserting it via crop needle as you advised?

Dr Marshall’s reply:

Dissolve one crushed tablet in 10 mls of water. This makes a working solution which you can keep in the fridge. Shake well before use. This should do for a complete course. You can extrapolate the dose down, according to the number of birds involved.

Fancier’s response:

Thank you for your considerable help and advice. It is much appreciated and I have requested Gerald Binks to publish this on Budgerigar.co.uk for the general benefit of the fancy at large.