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Clonorchis sinensis is currently the most important parasite affecting public health problems in the Republic of Korea. We investigated the prevalence of C. sinensis infection among residents living along 5 major rivers in Korea. A total of 42,562 individual stool samples were collected from 37 localities and examined using the formalin-ether sedimentation technique. Helminth eggs were detected in 4,052 (9.5%) residents and 3,586 (8.4%) were infected with C. sinensis. The egg positive rate of C. sinensis in Nakdong, Seomjin, Geum, Yeongsan, and Han River was 11.7%, 9.9%, 6.5%, 3.1%, and 1.0%, respectively. The overall prevalence of clonorchiasis by sex was 11.2% in males and 6.2% in females. The age-prevalence was the highest in the 50-59 years band. It has been reconfirmed that the endemicity of clonorchiasis is higher in southern areas of Korea, especially along Nakdong and Seomjin Rivers. A combination of continuous control programs with health education initiatives is urgently required in these highly endemic areas of clonorchiasis in Korea.
Until the 1970s in the Republic of Korea (Korea), parasitic infections with soil-transmitted intestinal nematodes, such as Ascaris lumbricoides, Trichuris trichiura, and hookworms, were highly prevalent [1,2]. Since 1971, nationwide surveys have been conducted every 5-7 years in order to estimate the infection status of intestinal helminth parasites until 2004 [3]. In the first 1971 survey, the overall prevalence was 84.3%, and by 2004, the rate had dramatically decreased to 3.7%. The rapid decrease in the overall prevalence of intestinal parasites over the past several decades has been attributed mainly to nationwide control programs and health education initiatives undertaken by the Korean government along with improvements in the living conditions and quality of life in Korea [4]. Despite the remarkable decrease of soil-transmitted nematode infections, the prevalence of fish-borne trematode infections such as clonorchiasis and metagonimiasis has still remained to be relatively high [5].
The liver fluke, C. sinensis, is the most important helminth in Korea these days, and clonorchiasis has been known as the cause of biliary pathogenesis, i.e., inflammation, dilatation, wall thickening, mucosal hyperplasia, liver cirrhosis, and even cholangiocarcinoma [6-8]. Among human diseases caused by parasites, clonorchiasis is ranked at the first due to its social, economic, and public health impacts in Korea. Clonorchiasis is endemic in most of the major river basins of Korea [9]. In 1981, the egg positive rates of people living in those river basins differed considerably; 40.2% in Nakdong River, 30.8% in Yeongsan River, 17.3% in Seomjin River, 15.7% in Han River, 15.9% in Tamjin River, and 12.0% in Geum River [10]. However, in 2007, the positive rates of C. sinensis in Nakdong, Seomjin, Yeongsan, Geum, and Han Rivers were 12.2%, 9.5%, 3.3%, 3.0%, and 1.0%, respectively [11]. Although the infection rates of C. sinensis in these major rivers decreased considerably over the past 20 years, clonorchiasis continues to persist and is currently considered as the most important helminthiasis in Korea.
In this study, we investigated the infection status of populations identified to be at risk of clonorchiasis, notably among residents living along 5 major rivers. The surveyed areas consisted of 37 counties, which are located in the vicinity of the Han, Geum, Yeongsan, Seomjin, and Nakdong Rivers, Korea. A total of 42,562 fecal specimens were collected from residents of these regions using a random household sampling method from February to November 2008 (Fig. 1). Stool specimens in plastic containers (1/person) collected in individual survey areas were transferred to the laboratory of National Institute of Health, and then examined by means of the formalin-ether sedimentation technique. Microscopic examinations were performed twice by well-trained technicians. The egg positive rate was estimated by arithmetic means. The egg positive individuals were treated with either praziquantel or other appropriate anti-parasitic drugs at the end of the study.
More than 10 species of helminth eggs were detected in 4,052 (9.5%) stool samples (Table 1). Eggs of C. sinensis were found in 3,586 (8.4%) fecal specimens of residents. The prevalence of clonorchiasis was highest in residents of Nakdong River (11.7%), followed by Seomjin River (9.9%), Geum River (6.5%), Yeongsan River (3.1%), and Han River (1.0%). Especially, Gyeongju-si (city) had the highest rate of 25.9%, followed by Hadong-gun of 21.9%, which were located in the mid- or downstream of Nakdong and Seomjin Rivers, respectively. Egg positive rates by surveyed areas are shown in Table 2.
The overall prevalence of clonorchiasis by sex was 11.2% in males and 6.2% in females (Table 3). The egg positive rate by age group was highest in the 50-59 age band, followed by the forties (8.9%), sixties (8.8%), seventies (7.8%), thirties (5.7%), over 80 (5.2%), twenties (2.2%), and below 19 (1.0%) (Table 4).
The present study provided the prevalence of C. sinensis infection among residents living along 5 major rivers of Korea and confirmed the high endemicity of C. sinensis infection in southern localities. Although the prevalence of clonorchiasis along the major rivers appears to decline over the past decade, we identified that Nakdong and Seomjin Rivers are still highly endemic regions in common with previous studies; a national survey undertaken in 1981 reported that the egg positive rates of people living along these major river basins were 40.2% in Nakdong River, 30.8% in Yeongsan River, 17.3% in Seomjin River, 15.7% in Han River, 15.9% in Tamjin River, and 12.0% in Geum River [10]. Also, in 2006, the egg positive rates of C. sinensis observed in the river basins of Nakdong, Seomjin, Yeongsan, and Geum were 17.1%, 11.2%, 5.5%, and 4.6%, respectively [9]. In addition, our results showed that the positive rates of overall intestinal parasites and C. sinensis in residents along 5 major rivers was 9.5% and 8.4%, respectively. The 9.5% prevalence of overall intestinal parasites is 2-fold higher than the national intestinal helminth prevalence of 3.7% in 2004 [3].
The infection status of C. sinensis according to age groups appears to be a typical pattern for C. sinensis infection, reaching a peak at the age groups of 40-49 and 50-59 years. These results suggest that the eating habit of raw fishes containing C. sinensis metacercariae is a deeply rooted traditional custom among residents living in rural and riverside areas. As well, the higher prevalence in males than in females may be caused by frequent alcohol consumption and raw freshwater fish intake with increasing activities such as fishing that are mostly carried out by men.
While not conceptually new, our results provided the basic data and important information regarding the prevalence of clonorchiasis in high risk regions in Korea and are valuable for providing control strategies and medication of clonorchiasis patients in these areas.
Notes
We have no conflict of interest related to this work.
This study was supported by parasitic disease surveillance and control program of the National Institute of Health, Ministry of Health and Welfare, Republic of Korea (NIH-4800-4847-311).
Fig. 1.
Surveyed areas along 5 major rivers, the Republic of Korea.
Table 1.
Positive rates of parasite eggs by fecal examination in residents along 5 major rivers
Table 1.
Parasite species
No. positive cases (%)
Overall intestinal parasites
4,052 (9.5)
Helminths
Clonorchis sinensis
3,586 (8.4)
Metagonimus spp.
411 (1.0)
Trichuris trichiura
63 (0.1)
Echinostoma spp.
12 (0.03)
Hookworm
5 (0.01)
Ascaris lumbricoides
4 (0.01)
Gymnophalloides seoi
4 (0.01)
Strongyloides stercolalis
4 (0.01)
Trichostrongylus orientalis
1 (0.002)
Diphyllobothrium sp.
1 (0.002)
Co-infection
C. sinensis+Metagonimus spp.
78 (0.18)
C. sinensis+Echinostoma spp.
7 (0.02)
C. sinensis+T. trichiura
5 (0.01)
Table 2.
Prevalence of overall intestinal parasites and C. sinensis according to localities and river basins
Table 2.
River basins
Locality
No. of examination
No. of positive (%)
No. of cumulative positive (%)
C. sinensis (%)
Han river
Hongcheon-gun
1,016
22 (2.2)
22 (2.2)
16 (1.6)
Inje-gun
1,265
15 (1.2)
15 (1.2)
8 (0.6)
Yanggu-gun
1,025
9 (0.9)
9 (0.9)
4 (0.4)
Yeongwol-gun
1,349
35 (2.6)
37 (2.7)
19 (1.4)
Subtotal
4,655
81 (1.7)
83 (1.8)
47 (1.0)
Geum river
Buyeo-gun
1,433
47 (3.3)
47 (3.3)
40 (2.8)
Daejeon-si
1,075
42 (3.9)
42 (3.9)
40 (3.7)
Geumsan-gun
1,209
61 (5.0)
62 (5.1)
53 (4.4)
Gongju-si
1,016
48 (4.7)
48 (4.7)
47 (4.6)
Muju-gun
1,708
204 (11.9)
208 (12.2)
190 (11.1)
Yeongdong-gun
287
74 (25.8)
78 (27.2)
68 (23.7)
Subtotal
6,728
476 (7.1)
485 (7.2)
438 (6.5)
Yeongsan river
Hampyeong-gun
1,144
47 (4.1)
52 (4.5)
29 (2.5)
Muan-gun
1,267
83 (6.6)
83 (6.6)
32 (2.5)
Naju-si
1,271
54 (4.2)
54 (4.2)
45 (3.5)
Yeongam-gun
1,041
48 (4.6)
48 (4.6)
40 (3.8)
Subtotal
4,723
232 (4.9)
237 (5.0)
146 (3.1)
Seomjin river
Boseong-gun
1,200
141 (11.8)
148 (12.3)
123 (10.3)
Gokseong-gun
1,650
169 (10.2)
178 (10.8)
137 (8.3)
Gwangyang-si
1,394
148 (10.6)
149 (10.7)
86 (6.2)
Hadong-gun
1,065
281 (26.4)
306 (28.7)
233 (21.9)
Imsil-gun
1,074
66 (6.1)
68 (6.3)
57 (5.3)
Suncheon-si
1,162
136 (11.7)
144 (12.4)
112 (9.6)
Subtotal
7,545
941 (12.5)
993 (13.2)
748 (9.9)
Nakdong river
Andong-si
1,932
258 (13.4)
261 (13.5)
242 (12.5)
Bonghwa-gun
936
20 (2.1)
20 (2.1)
16 (1.7)
Changnyeong-gun
1,044
147 (14.1)
149 (14.3)
141 (13.5)
Changwon-si
851
58 (6.8)
58 (6.8)
56 (6.6)
Geochang-gun
1,256
63 (5.0)
64 (5.1)
61 (4.9)
Gimhae-si
184
6 (3.3)
6 (3.3)
6 (3.3)
Gyeongju-si
710
185 (26.1)
185 (26.1)
184 (25.9)
Haman-gun
1,142
121 (10.6)
122 (10.7)
111 (9.7)
Hapcheon-gun
1,142
184 (16.1)
189 (16.5)
180 (15.8)
Jinju-si
1,020
137 (13.4)
140 (13.7)
134 (13.1)
Miryang-si
1,603
291 (18.2)
294 (18.3)
268 (16.7)
Sancheong-gun
1,365
226 (16.6)
228 (16.7)
222 (16.3)
Sangju-si
1,067
91 (8.5)
92 (8.6)
86 (8.1)
Uiryeong-gun
955
115 (12.0)
115 (12.0)
112 (11.7)
Yecheon-gun
1,314
152 (11.6)
152 (11.6)
151 (11.5)
Yeongdeok-gun
1,253
154 (12.3)
162 (12.9)
125 (10.0)
Yeongyang-gun
1,137
114 (10.0)
114 (10.0)
112 (9.9)
Subtotal
18,911
2,322 (12.3)
2,351 (12.4)
2,207 (11.7)
Total
42,562
4,052 (9.5)
4,149 (9.7)
3,586 (8.4)
Table 3.
Positive rate of C. sinensis according to gender and river basins
Table 3.
River basins
No. of positive / No. examined (%)
Male
Female
Total
Han river
32/2,518 (1.3)
15/2,137 (0.7)
47/4,655 (1.0)
Geum river
307/3,076 (10.0)
131/3,628 (3.6)
438/6,728 (6.5)
Yeongsan river
84/1,915 (4.4)
62/2,808 (2.2)
146/4,723 (3.1)
Seomjin river
422/3,221 (13.1)
326/4,324 (7.5)
748/7,545 (9.9)
Nakdong river
1,306/8,555 (15.3)
901/10,327 (8.7)
2,207/18,911 (11.7)
Total
2,151/19,285 (11.2)
1,435/23,224 (6.2)
3,586/42,562 (8.4)
Table 4.
Prevalence of C. sinensis eggs according to age groups and river basins
Table 4.
River basins
No. of positive / No. of examined (%)
Total
1-19
20-29
30-39
40-49
50-59
60-69
70-79
80-
Han river
47/4,655
1/242
7/719
3/327
11/652
17/965
4/917
4/706
0/115
(1.0)
(0.4)
(1.0)
(0.9)
(1.7)
(1.8)
(0.4)
(0.6)
(0.0)
Geum river
438/6,728
2/302
5/163
7/342
48/738
127/1,330
122/1,746
107/1,638
15/390
(6.5)
(0.7)
(3.1)
(2.0)
(6.5)
(9.5)
(7.0)
(6.5)
(3.8)
Yeongsan river
146/4,723
0/56
0/56
3/103
18/378
37/893
48/1,531
35/1,428
4/261
(3.1)
(0.0)
(0.0)
(2.9)
(4.8)
(4.1)
(3.1)
(2.5)
(1.5)
Seomjin river
748/7,545
6/225
11/116
29/276
77/642
152/1,097
203/2,073
187/2,265
34/626
(9.9)
(2.7)
(9.5)
(10.5)
(12.0)
(13.9)
(9.8)
(8.3)
(5.4)
Nakdong river
2,207/18,911
3/377
6/235
49/558
224/1,815
534/3,773
666/5,523
517/4,880
69/938
(11.7)
(0.8)
(2.6)
(8.8)
(12.3)
(14.2)
(12.1)
(10.6)
(7.4)
Total
3,586/42,562
12/1,202
29/1,289
91/1,606
378/4,225
867/8,058
1,043/11,790
850/10,917
122/2,330
(8.4)
(1.0)
(2.2)
(5.7)
(8.9)
(10.8)
(8.8)
(7.8)
(5.2)
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