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１９９２～１９９４年，对黑龙江省密山市及吉林省珲春市森林脑炎疫源地进行了流行病学调查，对东北三省九地人血清进行了抗体检测。从密山和珲春地区捕获的２１８５只嗜群血蜱和１２３只森林革蜱中分离出了９株森林脑炎病毒。从当地捕获的野鼠血清中查到特异性抗体，阳性率为１２．０％。在黑龙江省的新青、密山及吉林省的珲春、抚松、靖宇等地居民血清中检出特异性抗体，阳性率分别为２．８％、２．２％、１０．９％、１．２％和４．３％。从而认为原森林脑炎自然疫源地仍然相当稳定地存在。随着经济开发，对外口岸开放，旅游事业发展，外来人群进入，其森林脑炎的威胁有可能增加，应引起重视。
From 1992 to 1994, epidemiological investigation was conducted in Mishan City, Heilongjiang Province and Hunchun City, Jilin Province. Antibodies were detected in serum of nine people in three provinces in Northeast China. Nine forest encephalitis viruses were isolated from 2185 B. violaceus and 123 forest ticks captured in Mishan and Hunchun areas. Specific antibodies were detected in the wild rat serum captured locally, with a positive rate of 12.0%. The specific antibodies were detected in the serum of residents in Hsinchu, Mishan and Hechun of Jilin Province, Fusong and Jingyu in Heilongjiang Province. The positive rates were 2.8%, 2.2%, 10.9%, 1 .2% and 4.3%. Therefore, the natural foci of original forest encephalitis still exist quite fairly. With economic development, the opening of foreign ports, the development of tourism, and the entry of outsiders, the threat of forest encephalitis may increase, which deserves our attention.