Aspergillus is a common mold genus that humans and animals are continually breathing, but that rarely causes problems. However, in patients with suppressed immune systems, or if introduced directly into the spinal column, the fungus can be deadly. Despite the availability of antifungal agents, aspergillosis in the central nervous system carries a poor prognosis. Though this case sparked the nationwide investigation, as of November 4, the CDC said A. fumigatus had been identified in only one patient. Almost all cases in the outbreak involved a different fungus, Exserohilum rostratum , another common mold that rarely causes problems. 
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Inflammation of the meninges may lead to abnormalities of the cranial nerves , a group of nerves arising from the brain stem that supply the head and neck area and which control, among other functions, eye movement, facial muscles, and hearing.   Visual symptoms and hearing loss may persist after an episode of meningitis.  Inflammation of the brain ( encephalitis ) or its blood vessels ( cerebral vasculitis ), as well as the formation of blood clots in the veins ( cerebral venous thrombosis ), may all lead to weakness, loss of sensation, or abnormal movement or function of the part of the body supplied by the affected area of the brain.