Volume 41, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Field studies were conducted in central Sweden from 1983 through 1985 to obtain information on the etiologic agent of Ockelbo disease, described in Sweden in the 1960s and probably identical to Pogosta disease in Finland and to Karelian fever in the western USSR. Mosquitoes (63,644) collected during this 3 year period yielded 21 virus strains. Ockelbo virus isolations were from (5 strains), and/or (6 strains), and (3 strains). Inkoo (6 strains) and Batai (1 strain) viruses were recovered from Blood samples collected March–May from migrating birds on the southeast and east coast of Sweden and in July and August from resident birds in east-central Sweden were tested for neutralizing antibody to Ockelbo virus. Antibody was not detected in 328 birds sampled during spring migrations. Two of 58 (3.4%) birds bled in July and 8 of 78 birds (10%) bled in August had antibody to Ockelbo virus.

Ockelbo virus circulates in a mosquito-bird-mosquito cycle, with and and/or as enzootic vectors. Antibody was detected in passerine birds. Other classes of birds or other vertebrates were not sampled. may serve primarily to transmit virus to people. The role of other mosquito species as vectors for people is unknown.


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