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从一头孕猪体内及其所产全部乳猪均检出流行性出血热（ＥＨＦ）病毒抗原。孕猪分娩有死胎，且乳猪多在产后１周发病死亡，临床表现为食欲不振、烦躁不安、喜卧、行动缓慢。用ＥＨＦ病毒抗原阳性标本接种乳鼠，可检出特异性荧光物质。该孕猪感染发生在１０月，以发病季节可基本排除乙脑感染。血清学和流行病学调查结果表明，乳猪全部感染与发病均在ＥＨＦ最短潜伏期内；可排除水平传播的可能，故推测此孕猪系怀孕后期自然感染ＥＨＦ病毒后，经胎盘传播而导致乳猪感染发病。
Epidemic hemorrhagic fever (EHF) virus antigens were detected from a pregnant pig and from all of the piglets it produced. Pregnant pigs have stillbirth childbirth, and suckling pigs died in the first week postpartum, the clinical manifestations of loss of appetite, irritability, hi lying, slow action. Inoculated with neonatal EHF virus antigen positive samples can detect specific fluorescent substances. The pregnant pig infection occurred in October, the season can be basically ruled out JE infection. Serological and epidemiological survey results show that all piglets infected with the incidence of EHF are in the shortest incubation period; can rule out the possibility of horizontal transmission, it is speculated that the pregnant pigs naturally infected with EHF during late pregnancy after the placental transmission caused by milk Pig infection.