向世卫组织报告的信息表明与病猪或死猪密切接触是人感染的主要感染源。
Information reported to WHO suggests that close contact with diseased or dead pigs is the principal source of human infection.
对5例自然发病猪，2例人工感染猪以及7例用组织培养病毒回归的乳猪进行了系统病理组织学检查。
A systematic histopathologic study of red skin disease of swine was made on 5 naturally infected pigs, 2 experimentally infected pigs and 7 new-born piglets inoculated with tissue culture virus.
病猪肋骨骨骺处出现明显的组织学病变。
A marked historical change occurs at the epiphysis of the ribs of infected pigs.
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