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KMID : 0359319830230020223
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Korean Journal of Veterinary Research
1983 Volume.23 No. 2 p.223 ~ p.224
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Epidemiological Observations
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Han Du-Seok
Rim Byung-Moo
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Abstract
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Since the first observation of porcine Eperythrozoon in Korea in 1972, this disease has revealed increased morbidity with high mortality every year from 1976. However, no biological and epidemiological observations on the disease have been established in Korea. A preliminary study on the disease was attempted and the results obtained were summarized as follows:
Although the infection ratio, form, and size of the organism have shown seasonal variation, the affected animals showed 100% infection ratio of it, while the normal pigs from slaughter houses showed 54% infection ratio, In blood smears the Eperythrozoon showed pleomorphism and ranged in size from 0.5 to 5㎛ But the samples which were stored 0℃ for one week or at -20℃ for twenty-four hours manifested various large sized organisms ranging from 1. 4 to 8.5㎛.
Affected animals showed many organisms occuring on the surface of erythrocytes and in the plasma, while a small number were found from the bone marrow. It was characteristic that massive organisms were found in the contents of intestinal tracts with moderate numbers from the urine of the frozen cadavers. The peripheral blood of experimentally infected pigs has shown the organisms for more than two months accompanying 40℃ in body temperature. The organisms were found from pressed smear samples of the fly or the mosquito which were captured in the near circumstances of the affected animals. It is assumed that quite high mortality has been found with coincident infection of hog cholera or after the vaccination.
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