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1975年初斐济某岛发生高出血率的登革Ⅰ型广泛流行。在那同一岛上,1971年曾发生过登革Ⅱ型流行范围较小的暴发,第二次世界大战期间也有过登革Ⅰ型发生。而在1945～1971年期间没有发生过登革或其他黄热病毒感染。根据这个流行史,假设在1975年时30岁以下的人群对登革Ⅰ型易感是合理的。而且,明知一些易感者过去曾患过登革Ⅱ型,一些没有患
Dengue type I, which had a high rate of bleeding on an island in Fiji in early 1975, became widespread. On that same island, a small outbreak of dengue type II epidemic occurred in 1971 and dengue type I occurred during the Second World War. No dengue or other yellow fever virus infection occurred between 1945 and 1971. Based on this epidemic history, it is assumed that people under the age of 30 in 1975 were sensitized to dengue type 1 susceptibility. Also, knowing that some susceptible people have had dengue type II in the past, some do not have it