Hip
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CFS is a diagnosis of exclusion and the criteria referred to (CDC working case definition) apply to humans not other species.
That does not imply that animals can't get ME/CFS though.
Besides that, as any good vet or doctor will tell you, bacterial (Staph) septicaemia is treated with antibiotics, not arsenicals.
Nevertheless, the bacteremia that Dr Tarello and his wife had was well-documented, did not improve on antibiotics, but vanished after potassium arsenite treatment:
Blood cultures proved Staph-positive and micrococci-like organisms in the blood were repeatedly observed in the 3-year period preceding the arsenical therapy, during which several medicaments, including antibiotics, proved unsuccessful. Following treatment with a low dosage arsenical drug (potassium arsenite 0.5%, im., 1 ml/12 h, for 10 days) both patients experienced complete remission. At the post-treatment control made 1 month later, micrococci had disappeared from the blood, and the CD4/CD8 ratio was raising.
Source: 1
Though it is possible that the potassium arsenite treatment may have also acted on other infections present in these patients and animals, such as on a coxsackievirus B infection. Since coxsackievirus B has some immunosuppressive properties, I wonder if that might have been the cause of the bacteremia. Analogously, human ME/CFS patients get gut dysbiosis, which is a bacterial overgrowth, and perhaps due to immunosuppression.