That's not all--hemorrhagic fever could develop even without intersecting infections. The Aedes aegyptii has a unique characteristic which enables it to "screen" a virus so that it becomes more virulent with each generation. After months or years, the virus may become so serious that it can cause hemorrhagic dengue fever the first time a person gets infected.
甚至，不一定要經由交叉感染，憑著南部埃及斑蚊獨特的篩選病毒的特性，病毒會一代強過一代，經年累月後，也有可能第一次感染就引發登革出血熱。