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An Introduction to Medical Entomology

For educational purposes.

OMSK HAEMORRHAGIC FEVER

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A Flavivirus causes this fever, which is similar to Kyasanur Forest Disease. It is found in the Omsk Region of Siberia. The principal vector is Dermacentor reticulatus (= D. pictus) that draws blood from rodents such as muskrats, which are the main amplifying hosts (Service 2008). Other vectors include Dermacentor marginatus and Ixodes persulcatus.

Infected ticks may pass infections transstadially to other tick nymphs or adults, and transovarial transmission also occurs (Service 2008). Humans coming into contact with infected ticks can cause infection, but the disease can also be passed directly by an infected animal's urine or feces. Consuming milk of infected goats or sheep can also cause infection.

Symptoms vary but are similar to other virus-caused fevers. Early removal of ticks is essential to recovery.

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Key References: <medvet.ref.htm> <Hexapoda>

Matheson, R. 1950. Medical Entomology. Comstock Publ. Co, Inc. 610 p.

Service, M. 2008. Medical Entomology For Students. Cambridge Univ. Press. 289 p

Legner, E. F. 1995. Biological control of Diptera of medical and veterinary importance. J. Vector Ecology 20(1): 59_120.

Legner, E. F. 2000. Biological control of aquatic Diptera. p. 847_870. Contributions to a Manual of Palaearctic Diptera,

Vol. 1, Science Herald, Budapest. 978 p.