[Comparison study on distribution of two types of hemorrhagic fever with renal syndrome (HFRS)].

IFAT-positive serum samples were typed by HI and divided into Appodemus-type (type A) and Rattus-type (type R). The results showed that in Pingdu and Jimo counties, the patients were mainly of type A, whereas in Junan and in Tengzhou counties, the patients were mainly of type R. The age distribution showed that 96.0% of the type A patients belonged to age groups between 15-54 years, and no patients were younger than 15 years, or older than 65 years. The age distribution in type R patients, however, showed 76.5% of them were 15-54 years of age. Male/Female ratio was 3.3:1 in type A patients and 1.5:1 in type R patients. 80% of the type A patients were farmers. There were more housewives, students and children in type R than in type A patients. Type A patients usually occurred during Oct. and Dec. with only one peak in type A patients and two peaks in type R patients.