| [isolation of the west nile fever virus from human patients during an epidemic outbreak in the volgograd and astrakhan regions]. | two strains of west nile virus leiv 27889 vig and ast 986 were isolated from the brain of a dead subject and from the blood of a patient, respectively, during an outbreak of serous meningitis and meningoencephalitis in july-september, 1999, in the volgograd region, krasnodar territory, and astrakhan region. these strains reacted with convalescent sera in hemagglutination inhibition test, which proves their etiological role in this outbreak. | 2000 | 10867987 |