西安地区为肾综合征出血热 (ＨＦＲＳ)老疫区。据中国地理流行病学调查证实 ,1990年前属姬鼠型ＨＦＲＳ疫区〔1〕。随着时间的推移 ,疫区型别有所变化 ,对此虽有零星报道〔2 -4〕,但未进行过系统的研究。为此 ,我们以户县为基地 ,并搜集周至、长安等县有关资料 ,对西安地区ＨＦ Xi’an area for hemorrhagic fever with renal syndrome (HFRS) old area. According to Chinese geographical epidemiological survey confirmed that in 1990 before the genus APRS HFRS epidemic [1]. With the passage of time, the type of epidemic area has changed. Although sporadic reports [2-4] have been made, no systematic study has been conducted. To this end, we Hu County as a base, and collect weeks to Changan County and other relevant information on the Xian HF