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Egyptian fever of cattle

The transmission of Theileria annulata (Dzchunkowsky & Luhz 1904) by Hyalomma excavatum, Koch, 1844

Published online by Cambridge University Press:  06 April 2009

R. Daubney  and
M. Sami Said
R. Daubney
Affiliation:
Serum and Vaccine Institute, Abbassiah, Cairo, Egypt
M. Sami Said
Affiliation:
Serum and Vaccine Institute, Abbassiah, Cairo, Egypt
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Extract

The disease, Egyptian fever of cattle, has been observed at the Serum Institute, Abbassiah, in Cyrenaican and Cyprus cattle, and less frequently in native Egyptian cattle. The responsible Theileria has been determined as T. annulata (Dzchunkowsky & Luhz, 1904), and both natural and experimental transmission has been demonstrated with Hyalomma excavatum Koch 1844, of Delpy (1949b).

H. excavatum in Egypt is a three-host tick, which hibernates during the winter months in the walls of buildings in the engorged nymphal and fasting adult stages. Transmission has been effected with nymphae and adults, infected in each case by feeding the preceding stage on reacting or recovered cattle. On no occasion has infection been observed to pass through the egg to the larval stage. Infection can also be transmitted by inoculation of the blood of a reacting animal in which schizonts are demonstrable.

Type
Research Article
Information
Parasitology , Volume 41 , Issue 3-4 , December 1951 , pp. 249 - 260
Copyright
Copyright © Cambridge University Press 1951

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References

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