AFP and viral encephalitis: The median length of hospitalization for the overall sample was 13.5 days (range: 3–60 days): 13 days (range: 3–60 days) for encephalitis patients, 4.5 days (range: 3–5 days) for meningitis patients, and 22.5 days (range: 7–47 days) for AFP patients (Table 5).