陕西省旬邑县八年的慢型克山病病情。认为急型克山病、亚急型克山病发病已显著减少,而慢型克山病特别是自然慢型克山病仍有少数病例发生,表明致病因子在病区依然存在。未出现暴发流行的原因,只能说明是致病因子和发病诱因及相关因素相对减弱,发病以潜、慢型克山病的形式表现出来。 Shaanxi province Xunyi eight years of chronic Keshan disease. It is considered that acute Keshan disease and subacute Keshan disease have been significantly reduced, while there are still a few cases of chronic Keshan disease, especially natural Keshan disease, indicating that the pathogenic factors still exist in the disease area. The reasons for the outbreak did not appear outbreak, only shows that the pathogenic factor and the causes of the disease and related factors are relatively weakened, the incidence of latent Kethan disease in the form of Keshan disease manifested.