Other fungi were found in eight cases, but were not known to be significant. According to specialists in fungal diseases, cases of meningitis caused by "Aspergillus" are rare, but cases caused by black mold are even more so, making the discovery of the outbreak and the recommended treatment almost entirely untrodden medical ground. "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. On October 12, 2012, the CDC reported that as of that date, the median age of the patients was 68 years (range: 23–91 years); 48 (69%) were female. At presentation, 57 (81%) had headache, 24 (34%) had fever, 21 (30%) had nausea, and seven (10%) had photophobia (intolerance to bright light). Atypical neurologic symptoms were observed in a minority of patients, subtle gait disturbances were seen in three (4%), and a history of falls was described in eight (11%). Meningeal signs, including nuchal rigidity (the inability to flex the neck forward), Kernig's sign, or Brudzinski's sign, were uncommon, occurring in 10 (14%) patients. Stroke, either as a presenting sign, or as a complication of infection, occurred in 12 (17%). According to the CDC report, for 61 people with symptom onset date available, the earliest date was August 18. For the 48 patients with both injection date and symptom onset date available for analysis, the median time from last steroid injection to onset of symptoms was 15 days (range: 1–42). A total of 25 of the 48 patients received a single steroid injection; the median time from injection to onset of symptoms for those patients was 16 days (range: 4–42). People who received injections were most vulnerable to stroke and infection within the first 42 days of injection, but three months may be needed for symptoms to appear. Fungal infections associated with nonepidural injections were also reported.