A worker of an agricultural enterprise had been suffering from an acute disease with aggravating intoxication signs, which resulted in his death. On autopsy: the spleen is enlarged, flaccid, dark cherry-red on section, yields excessive pulpscrape. Soft meninges of the fornix and base of the brain are edematous and saturated with blood ("cardinal’s cap"). Microscopically: serous hemorrhagic inflammationof meningesand cerebral tissues. Make the diagnosis: