Dipetalonema viteae: Effects of hypo- and hyperthermic stress on microfilaremia in the Mongolian jird, Meriones unguiculatus |
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Authors: | Mark L Eberhard Francis C Rabalais |
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Institution: | Department of Parasitology, School of Tropical Medicine and Parasitology, Tulane University, New Orleans, Louisiana, U.S.A.;Department of Biological Sciences, Bowling Green State University, Bowling Green, Ohio 43403, U.S.A. |
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Abstract: | The effects of thermal stress on the numbers of circulating microfilariae of the filariid parasite, Dipetalonema viteae, in its host, the Mongolian jird, Meriones unguiculatus, was determined. The microfilaremia of each animal was allowed to stabilize, and the effects of stress were measured from this level. The ambient temperature was raised or lowered in 5C increments and maintained at each increment for a 24-hr period. Deep core body temperature of the jirds was recorded by the use of telemetry transmitters placed in the abdominal cavity. The transmitter signals were recorded on a Dynograph recorder. Blood samples were drawn at 0, 12, and 24 hr exposure to each ambient temperature, and microfilariae counted. Microfilaremial levels were then compared to numbers circulating prior to thermal stress. Both hypothermia and hyperthermia in the jird resulted in increased numbers of microfilariae in the peripheral blood. It is speculated that these fluctuations are changes in the percentage of the total microfilarial pool, and represent fluctuations of larvae being driven out of tissue and deep circulatory channels. |
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Keywords: | Host-parasite relationship Hypothermie stress Hyperthermic stress |
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