A Case of Dengue Hemorrhagic Fever in a Japanese Child

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Abstract
A 6‐year‐old Japanese girl contracted a febrile illness with hemorrhagic manifestations when she traveled in Indonesia. A remarkable decrease in the numbers of platelets and white blood cells was observed in her acute‐phase blood specimens. Her father, who accompanied her, showed dengue fever‐like symptoms at almost the same time as her illness. It was determined by serological tests that they were infected with dengue virus type 1. Moreover, she showed a secondary antibody response to the flavivirus due to the pre‐existing antibody to Japanese encephalitis virus. This is the first confirmed case of dengue hemorrhagic fever (DHF) in Japanese people.