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Rapid increase of scrub typhus, South Korea, 2001-2006.

Kweon SS, Choi JS, Lim HS, Kim JR, Kim KY, Ryu SY, Yoo HS, Park O - Emerging Infect. Dis. (2009)

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Scrub typhus, or tsutsugamushi disease, is a febrile illness caused by the rickettsial bacteria Orientia tsutsugamushi... Scrub typhus is endemic to a geographically distinct region, the so-called tsutsugamushi triangle, which includes Japan, Taiwan, China, and South Korea... In total, 23,929 cases, including 16,199 (67.7%) serologically confirmed cases, were reported between 2001 and 2006, of which 35.5% were male patients and 64.5% female patients... The number of cases peaked in 2005, with 2,331 and 4,449 cases in male and female patients, respectively... The autumn epidemic period was from October through November; 96.2% of all cases were reported during this period (Figure)... The proportion of cases identified in farmers decreased from 2001 (44.4%) to 2006 (36.4%); the number of cases in nonfarmers reached 4,121 (63.6%) in 2006... Many of the values reported in this study (64.5% of cases in female patients, 59.5% in nonfarmers, and 96.2% occurring in autumn) are higher than the values reported previously in Japan, Taiwan, and China... The higher incidence in female workers may be associated with conventional South Korean working behavior... Therefore, female workers are more likely to be exposed to infected mites... Previously, farmers were considered a high-risk group, but our results imply that the same or even more attention should be given to nonfarmers... We cannot exclude other modes of exposure such as golf, climbing, and other outdoor leisure activities... A 5-day work week was introduced in 2004, and, as a result, more leisure time has been available to urban residents... In addition, improved surveillance and diagnostic methods as well as changes in atmospheric temperature may have contributed to the increase.

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Monthly occurrence of scrub typhus cases in South Korea, 2001–2006.
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Figure 1: Monthly occurrence of scrub typhus cases in South Korea, 2001–2006.

Mentions: In total, 23,929 cases, including 16,199 (67.7%) serologically confirmed cases, were reported between 2001 and 2006, of which 35.5% were male patients and 64.5% female patients. The greatest number of cases was in the age group 50–69 years, in both male (47.2%) and female (51.7%) patients; however, there were 167 boys (2.0%) and 119 girls (0.8%) <10 years of age. The number of cases peaked in 2005, with 2,331 and 4,449 cases in male and female patients, respectively. In 2006, a total of 6,480 cases (2,364 and 4,116 in males and females patients), which is 2.5× the number reported in 2001, were reported. The autumn epidemic period was from October through November; 96.2% of all cases were reported during this period (Figure). The proportion of cases identified in farmers decreased from 2001 (44.4%) to 2006 (36.4%); the number of cases in nonfarmers reached 4,121 (63.6%) in 2006. The number and proportion of patients living in urban areas increased from 1,059 (40.2%) in 2001 to 3,230 (49.9%) in 2006. This trend was observed in both farmers and nonfarmers. The number of cases among farmers living in urban areas increased from 150 (12.8%) to 443 (18.8%), while the corresponding number of cases in nonfarmers went from 909 (62.0%) to 2,787 (67.6%). In addition, we identified different features of scrub typhus epidemicity, compared with those reported in previous studies (4–7). Many of the values reported in this study (64.5% of cases in female patients, 59.5% in nonfarmers, and 96.2% occurring in autumn) are higher than the values reported previously in Japan (4), Taiwan (5), and China (6). The higher incidence in female workers may be associated with conventional South Korean working behavior. Female workers typically work in a squatting position, with bare hands, and usually in dry fields, whereas male workers tend to work in a standing position, with tools, and in rice fields. Therefore, female workers are more likely to be exposed to infected mites.


Rapid increase of scrub typhus, South Korea, 2001-2006.

Kweon SS, Choi JS, Lim HS, Kim JR, Kim KY, Ryu SY, Yoo HS, Park O - Emerging Infect. Dis. (2009)

Monthly occurrence of scrub typhus cases in South Korea, 2001–2006.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2744253&req=5

Figure 1: Monthly occurrence of scrub typhus cases in South Korea, 2001–2006.
Mentions: In total, 23,929 cases, including 16,199 (67.7%) serologically confirmed cases, were reported between 2001 and 2006, of which 35.5% were male patients and 64.5% female patients. The greatest number of cases was in the age group 50–69 years, in both male (47.2%) and female (51.7%) patients; however, there were 167 boys (2.0%) and 119 girls (0.8%) <10 years of age. The number of cases peaked in 2005, with 2,331 and 4,449 cases in male and female patients, respectively. In 2006, a total of 6,480 cases (2,364 and 4,116 in males and females patients), which is 2.5× the number reported in 2001, were reported. The autumn epidemic period was from October through November; 96.2% of all cases were reported during this period (Figure). The proportion of cases identified in farmers decreased from 2001 (44.4%) to 2006 (36.4%); the number of cases in nonfarmers reached 4,121 (63.6%) in 2006. The number and proportion of patients living in urban areas increased from 1,059 (40.2%) in 2001 to 3,230 (49.9%) in 2006. This trend was observed in both farmers and nonfarmers. The number of cases among farmers living in urban areas increased from 150 (12.8%) to 443 (18.8%), while the corresponding number of cases in nonfarmers went from 909 (62.0%) to 2,787 (67.6%). In addition, we identified different features of scrub typhus epidemicity, compared with those reported in previous studies (4–7). Many of the values reported in this study (64.5% of cases in female patients, 59.5% in nonfarmers, and 96.2% occurring in autumn) are higher than the values reported previously in Japan (4), Taiwan (5), and China (6). The higher incidence in female workers may be associated with conventional South Korean working behavior. Female workers typically work in a squatting position, with bare hands, and usually in dry fields, whereas male workers tend to work in a standing position, with tools, and in rice fields. Therefore, female workers are more likely to be exposed to infected mites.

View Article: PubMed Central - PubMed

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

Scrub typhus, or tsutsugamushi disease, is a febrile illness caused by the rickettsial bacteria Orientia tsutsugamushi... Scrub typhus is endemic to a geographically distinct region, the so-called tsutsugamushi triangle, which includes Japan, Taiwan, China, and South Korea... In total, 23,929 cases, including 16,199 (67.7%) serologically confirmed cases, were reported between 2001 and 2006, of which 35.5% were male patients and 64.5% female patients... The number of cases peaked in 2005, with 2,331 and 4,449 cases in male and female patients, respectively... The autumn epidemic period was from October through November; 96.2% of all cases were reported during this period (Figure)... The proportion of cases identified in farmers decreased from 2001 (44.4%) to 2006 (36.4%); the number of cases in nonfarmers reached 4,121 (63.6%) in 2006... Many of the values reported in this study (64.5% of cases in female patients, 59.5% in nonfarmers, and 96.2% occurring in autumn) are higher than the values reported previously in Japan, Taiwan, and China... The higher incidence in female workers may be associated with conventional South Korean working behavior... Therefore, female workers are more likely to be exposed to infected mites... Previously, farmers were considered a high-risk group, but our results imply that the same or even more attention should be given to nonfarmers... We cannot exclude other modes of exposure such as golf, climbing, and other outdoor leisure activities... A 5-day work week was introduced in 2004, and, as a result, more leisure time has been available to urban residents... In addition, improved surveillance and diagnostic methods as well as changes in atmospheric temperature may have contributed to the increase.

Show MeSH
Related in: MedlinePlus