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THOSE OTHER ILLNESSES WOULD BE?
ALSO DO THEY PRESENT THE SYMPTOMS IN ORDER AND WITHIN 15=30 MINUTES FROM START TO FINISH?
So the merck manual says: "In poultry, increased thirst, dyspnea, fluid discharge from the beak, weakness, diarrhea, and leg paralysis are some of the common signs of salt poisoning."
Very rarely does one animal present with all the listed symptoms for a disease, so for example if you had a bird with weakness, diarrhea, and dyspnea this could be salt poisoning, severe parasitism, fowl cholera, mycoplasma infection... etc. If you had a bird with weakness, paralysis and seizures, you might consider mycotoxins, salt poisoning, west nile virus, meningitis, etc. I've had birds die from trauma that may have dyspnea, fluid from their beak, seizures and then die.
The keys to diagnose salt toxicity would be a new feed or water change followed by multiple birds being affected. The birds may show a variety of signs, but none of them are really going to tell you 100% that you are dealing with salt toxicity and not something that may just have similar signs.
An animal with severe toxicity should not necessarily be given free access to water, they will want to drink a lot which will drop the concentration of sodium in their body (by dilution) suddenly causing fluid to accumulate in the brain. It's a tough situation because they need to get fluids, but slowly.