You know what's unfortunate is that carnidazole, metronidazole, emtryl, and ronidazole are all chemically similar, so a parasite that can become resistant to one, may be resistant to others. Metronidazole has worked for me in the past with canker. It's the best suggestion you could give. There is another newer product that is a safe plant derived alkaloid called Berimax. It really knocks out canker as well as e.coli, salmonella, giardia. The pigeon folks know about it. They tried a 10% solution on a flock of pigeons and in 5 days 90% of parasites were gone. After that they tested a 20% solution of 1 ml per liter of water and it was gone in 10 hours when the crop flush was examined under a microscope. Berimax may be something to keep on hand, just like metronidazole if the symptoms don't clear up.
Siegel pigeon supply carries it: http://www.siegelpigeons.com/catalog-canker.html
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Good info, adding to my favs.
Siegel pigeon supply carries it: http://www.siegelpigeons.com/catalog-canker.html
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Good info, adding to my favs.