“…22,23 In one study of 1,700 patients with HIV infection, the prevalence of HIV-associated ALS was estimated as 3.5 cases/ 1,000 patients. 22 In comparison, the incidence of ALS in the general population is approximately 1 or 2 cases per 100,000/year and the prevalence is 4 to 6 cases per 100,000. 24 While the clinical presentation of HIV-associated MND is indistinguishable from sporadic ALS, the patients with HIV are typically younger, nearly all the cases are younger than 40 years of age at the time of onset of neurologic symptoms, and most of these patients are male.…”