Abstract
The possible sources for the epidemic of bluetongue in Portugal at the beginning of July 1956 were examined. Introduction through authorized importation of domestic or wild ruminants was not feasible, since no cattle, sheep or goats were imported and the wild ruminants were confined to Lisbon Zoo, which was too far from the initial outbreaks. Weather maps were examined to see if the wind could have carried infected Culicoides midges from North Africa. On 21 June 1956 infected midges in Morocco could have been taken offshore by southeast winds and then carried by south winds unusual at that time of year to the south coast of Portugal. The 200-300 km sea crossing would have taken some 10 h and been by day when air temperatures near the sea surface were about 18-20 C. Bluetongue had not been reported at that time in Moroccco, and the possibility of the presence of the virus in moroccan animals without clinical signs is discussed.
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Selected References
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- BARBAUD R., HERAULT M., PLACIDI L. Une virose du mouton d'introduction nouvelle en Europe et en Afrique du Nord: la blue tongue; note d'épidémiologie. Maroc Med. 1957 Feb;36(381):142–146. [PubMed] [Google Scholar]
- Erasmus B. J. Bluetongue in sheep and goats. Aust Vet J. 1975 Apr;51(4):165–170. doi: 10.1111/j.1751-0813.1975.tb00048.x. [DOI] [PubMed] [Google Scholar]
- FOSTER N. M., JONES R. H., MCCRORY B. R. PRELIMINARY INVESTIGATIONS ON INSECT TRANSMISSION OF BLUETONGUE VIRUS IN SHEEP. Am J Vet Res. 1963 Nov;24:1195–1200. [PubMed] [Google Scholar]
- Goldsmit L., Barzilai E., Tadmor A. The comparative sensitivity of sheep and chicken embryos to bluetongue virus and observations on viraemia in experimentally infected sheep. Aust Vet J. 1975 Apr;51(4):190–196. doi: 10.1111/j.1751-0813.1975.tb00053.x. [DOI] [PubMed] [Google Scholar]
- Jochim M. M., Jones R. H. Multiplication of bluetongue virus in Culicoides variipennis following artificial infection. Am J Epidemiol. 1966 Sep;84(2):241–246. doi: 10.1093/oxfordjournals.aje.a120637. [DOI] [PubMed] [Google Scholar]
- Luedke A. J., Jones R. H., Walton T. E. Overwintering mechanism for bluetongue virus: biological recovery of latent virus from a bovine by bites of Culicoides variipennis. Am J Trop Med Hyg. 1977 Mar;26(2):313–325. doi: 10.4269/ajtmh.1977.26.313. [DOI] [PubMed] [Google Scholar]
- Nevill E. M. Cattle and Culicoides biting midges as possible overwintering hosts of bluetongue virus. Onderstepoort J Vet Res. 1971 Jun;38(2):65–71. [PubMed] [Google Scholar]
- Pedgley D. E., Tucker M. R. Possible spread of African horse sickness on the wind. J Hyg (Lond) 1977 Oct;79(2):279–298. doi: 10.1017/s0022172400053109. [DOI] [PMC free article] [PubMed] [Google Scholar]