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山东省１９６８年发现首例流行性出血热（以下简称：出血热）后，发病逐年增多。１９７３年发病３５例；１９８３年发病５２０８例，此１１年间占全国发病数３－４２％；１９８４～１９８８年年发病数居全国各省（自治区、直辖市）之首，此５年间占全国发病数２４－８１％；１?
Shandong Province in 1968 found the first case of epidemic hemorrhagic fever (hereinafter referred to as: hemorrhagic fever), the incidence increased year by year. 35 cases were reported in 1973; 5,208 cases were reported in 1983, accounting for 3 - 42% of the total number of cases in this 11 years; the annual incidence in 1984 ~ 1988 was the highest in all provinces (autonomous regions and municipalities directly under the Central Government), accounting for 24 -81%; 1?