Emerging Infectious Disease ISSN: 1080-6059

Trends in Flavivirus Infections in Japan

Ichiro Kurane, Tomohiko Takasaki, and Ken-ichiro Yamada

Author affiliations: National Institute of Infectious Diseases, Tokyo, Japan

Cases of imported dengue and countries that persons visited before onset of symptoms, by year, Japan

Countries	'85	'86	'87	'88	'89	'90	'91	'92	'93	'94	'95	'96	'97	'98	'99	Total
No. of cases^a	4	1	4	4	1	11^b	6^b	14	7	11	16	15	6	42	11	153
Asia
Thailand	3	0	3	1	0	7	3	7	1	6	8	4	1	19	2	65
India	0	0	2	0	0	2	1	2	1	1	4	5	0	6	3	27
Philippines	2	1	1	1	0	1	3	1	3	1	1	1	1	8	1	26
Indonesia	0	0	0	1	0	0	0	3	1	2	2	3	1	5	0	18
Malaysia	0	0	1	0	0	2	0	0	0	0	1	2	0	1	1	8
Myanmar	0	0	0	0	0	0	0	0	0	0	1	0	0	3	4	8
Cambodia	1	0	0	0	0	0	0	0	1	0	1	0	0	3	1	7
Singapore	0	0	0	0	1	0	0	1	0	0	1	1	1	2	0	7
Nepal	0	0	1	0	0	0	0	1	0	1	0	0	1	1	0	5
Laos	0	0	0	0	0	0	1	0	0	1	0	0	1	2	0	5
Vietnam	0	0	0	0	0	0	0	0	0	1	0	0	1	2	0	4
Bangladesh	0	0	1	0	0	0	0	0	0	0	0	1	0	1	0	3
Maldives	0	0	0	0	0	1	0	0	0	0	0	0	0	1	1	3
Taiwan	0	0	0	2	0	0	0	0	0	0	0	0	0	0	0	2
China	0	0	0	0	0	0	0	0	0	0	0	0	0	2	0	2
Sri Lanka	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0	1
Oceania/South Pacific
Australia	0	0	0	0	0	0	1	0	0	0	0	0	0	0	0	1
Fiji	0	0	0	0	0	0	0	0	1	0	0	0	0	0	0	1
New Caledonia	0	0	0	0	0	0	0	0	0	0	1	0	0	0	0	1
Tahiti	0	0	0	0	0	0	0	0	0	0	0	0	1	0	0	1
Central America
Dominica	0	0	0	0	0	0	0	1	0	0	0	0	0	0	0	1
Guatemala	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0	1
Africa
Nigeria	0	0	0	0	0	0	0	0	0	0	0	1	0	0	0	1
Liberia	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0	1
Côte d'Ivoire	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0	1

^aSome patients visited more than one country.
^bIn 1990 and 1991, one patient each year had dengue hemorrhagic fever.