Evaluation of National Tsutsugamushi Disease Surveillance--Japan, 2000.
In Japan, Tsutsugamushi disease, which is caused by Orientia tsutsugamushi, is re-emerging with newly recognized strains and is now endemic in all prefectures except Hokkaido and Okinawa. We analyzed recent surveillance data to describe the epidemiology of Tsutsugamushi disease and to evaluate the newly implemented national surveillance system according to the CDC guidelines for evaluating surveillance systems. In 2000, 756 cases of Tsutsugamushi disease were reported from 37 of 47 prefectures; two of these cases were fatal. The median age of case-patients was 64 years (range: 2 - 94 years); 414 (54.8%) were male. In northern Japan, most cases were diagnosed in the months of May through July and in the months of October through December, and in southern Japan, cases were diagnosed almost year-round with a peak from October through December and in January. Reporting and transfer of surveillance information from the prefecture to the national level was effective and timely, but the completeness and quality of case reporting could still be improved. The current system for Tsutsugamushi disease surveillance is useful for describing epidemiologic patterns by time, prefecture, and demographic characteristics. However, collection of additional information on suspected place of transmission, activity performed at the place of transmission, or the case-patient's profession would likely make the system more valuable for outbreak detection and for better defining populations at risk.
Matsui
Tamano
T
Field Epidemiology Training Program Japan, National Institute of Infectious Diseases, Tokyo 162-8640, Japan. djyu@kaiju.medic.kumamoto-u.ac.jp
Kramer
Michael H
MH
Mendlein
James M
JM
Osaka
Ken
K
Ohyama
Takaaki
T
Takahashi
Hiroshi
H
Ono
Tomomichi
T
Okabe
Nobuhiko
N
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002487:Centers for Disease Control and Prevention, U.S.; D002648:Child; D002675:Child, Preschool; D021821:Communicable Diseases, Emerging / Q000453:epidemiology; D003625:Data Collection / Q000592:standards*; D005260:Female; D017408:Guidelines as Topic; D006801:Humans; D007223:Infant; D007564:Japan / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D012285:Orientia tsutsugamushi; D011159:Population Surveillance / Q000379:methods*; D012612:Scrub Typhus / Q000453:epidemiology*; D013997:Time Factors; D014481:United States