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Jong-Yil Chai,Tai-Soon Yong,Keeseon S. Eom,Duk-Young Min,Eun-Hee Shin,Virasack Banouvong,Bounnaloth Insisiengmay,Sithat Insisiengmay,Bounlay Phommasack,Han-Jong Rim 대한기생충학열대의학회 2010 The Korean Journal of Parasitology Vol.48 No.4
Phongsaly Province, located in the northernmost area of Lao PDR, was previously suggested to be endemic for the liver fluke Opisthorchis viverrini infection. To confirm, or rule out, this suggestion, the Phonxay village in the Khoua District, Phongsaly Province, was selected for a survey. Ten volunteers (8 men and 2 women aged 31-57 years) who consumed raw freshwater fish and had gastrointestinal troubles were treated with a single dose of praziquantel (40 mg/kg) and pyrantel pamoate (10 mg/kg) and purged with magnesium sulfate to recover any worm parasites. Eight of the 10 volunteers expelled 1 or more species of trematodes, nematodes, or cestodes (worm positive rate; 80%). The worms were morphologically identified as H. taichui (861 worms from 8 people), H. yokogawai (59 from 6 people), Phaneropsolus bonnei (1 from 1 person), Trichostrongylus sp. (2 from 2 people), Ascaris lumbricoides (2 from 1 person), Enterobius vermicularis (11 from 3 people), and Taenia saginata (1 strobila with scolex from 1 person). The results indicate that the mountainous area of Phongsaly Province, Lao PDR, is not endemic for the liver fluke but endemic for intestinal flukes, in particular, Haplorchis taichui and H. yokogawai.
Ultrasonographic investigation of cholangiocarcinoma in Lao PDR
Kim, Ju Yeong,Yong, Tai-Soon,Rim, Han-Jong,Chai, Jong-Yil,Min, Duk-Young,Eom, Keeseon S.,Sohn, Woon-Mok,Lim, Jae Hoon,Choi, Dongil,Insisiengmay, Sithat,Phommasack, Bounlay,Insisiengmay, Bounnaloth Elsevier 2018 Acta Tropica Vol.182 No.-
<P><B>Abstract</B></P> <P> <I>Opisthorchis viverrini</I> is a group 1 carcinogen that causes cholangiocarcinoma (CCA). Although opisthorchiasis is known to be severely endemic to several areas along the Mekong River in Lao PDR, the CCA status of residents of this region is still under investigation. In this study, we analyzed the results of abdominal ultrasonography (US) performed on 6113 residents in 9 provinces (Vientiane Municipality, Savannakhet, Phongsaly, Khammouane, Saravane, Champasak, Vientiane, Xieng Khuouang, and Luang Prabang provinces) of Lao PDR from 2007 to 2011. Overall, 51 cases (0.83%) were detected with suspected CCA. The CCA rates in Vientiane Municipality and in Savannakhet and Khammouane provinces were 1.45%, 1.58%, and 1.09%, respectively. However, in the other 6 provinces, the rate of CCA averaged only 0.26%. In the 3 provinces with higher rates of CCA, bile duct dilatation (grade ≥ 2) was also significantly more prevalent (<I>P</I> <I><</I> 0.0001). These results are concordant with previous reports showing a higher endemicity of opisthorchiasis in Vientiane Municipality and in Savannakhet and Khammouane provinces.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The cholangiocarcinoma (CCA) prevalence in Lao PDR was clarified. </LI> <LI> Nine provinces were surveyed, showing a CCA prevalence of 0.83%. </LI> <LI> Three provinces showed the highest prevalence for both CCA and bile duct dilatation. </LI> <LI> Opisthorchiasis is more prevalent to these three provinces. </LI> <LI> Portable abdominal ultrasonography is useful for surveying CCA in the field. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Differential diagnosis of <i>Taenia asiatica</i> using multiplex PCR
Jeon, Hyeong-Kyu,Chai, Jong-Yil,Kong, Yoon,Waikagul, Jitra,Insisiengmay, Bounnaloth,Rim, Han-Jong,Eom, Keeseon S. Elsevier 2009 Experimental parasitology Vol.121 No.2
<P><B>Abstract</B></P><P><I>Taenia asiatica</I> and <I>T. saginata</I> are frequently confused tapeworms due to their morphological similarities and sympatric distribution in Asian regions. To resolve this problem, a high-resolution multiplex PCR assay was developed to distinguish <I>T. asiatica</I> infections from infection with other human <I>Taenia</I> tapeworms. For molecular characterization, the species specificity of all materials used was confirmed by sequencing of the <I>cox1</I> gene. Fifty-two samples were analyzed in this study, comprising 20 samples of <I>T. asiatica</I> genomic DNA from China, Korea, and the Philippines; 24 samples of <I>T. saginata</I> from Belgium, Chile, China, Ethiopia, France, Indonesia, Korea, Laos, the Philippines, Poland, Taiwan, Thailand, and Switzerland; and 10 samples of <I>T. solium</I> from Cape Verde, China, Honduras, and Korea. The diagnostic quality of the results obtained using PCR and species-specific primers designed from valine tRNA and NADH genes was equal to that based on the nucleotide sequencing of the <I>cox1</I> gene. Using oligonucleotide primers Ta4978F, Ts5058F, Tso7421F, and Rev7915, the multiplex PCR assay was useful for the differentially diagnosing <I>T. asiatica</I>, <I>T. saginata</I>, and <I>T. solium</I> based on 706-, 629-, and 474-bp bands.</P>
Prevalence of Haplorchis taichui among humans and fish in Luang Prabang Province, Lao PDR
Sohn, W.M.,Yong, T.S.,Eom, K.S.,Min, D.Y.,Lee, D.,Jung, B.K.,Banouvong, V.,Insisiengmay, B.,Phommasack, B.,Rim, H.J.,Chai, J.Y. Verlag für Recht und Gesellschaft ; Elsevier 2014 Acta tropica Vol.136 No.-
This study confirmed the prevalence of the intestinal fluke Haplorchis taichui (Trematoda: Heterophyidae) among people and fish in Luang Prabang Province, Lao PDR. Fecal specimens were collected from 559 riparian people (229 males and 330 females), residing in 4 Districts (Luang Prabang, Xieng Ngeun, Pak Ou, and Nam Bak) and were examined by the Kato-Katz fecal smear technique. The overall helminth egg positive rate was 64.9%. The positive rate for small trematode eggs (STE), which may include H. taichui and other heterophyids, Opisthorchis viverrini, and lecithodendriids, was 15.2%. For recovery of adult helminths, 10 STE-positive people were treated with 40mg/kg praziquantel and 15mg/kg pyrantel pamoate, and then purged. Mixed infections with 3 Haplorchis species (H. taichui, H. pumilio, and H. yokogawai), a species of cestode (Taenia saginata), and several species of nematodes including Enterobius vermicularis and hookworms were found. The worm load for trematodes was exclusively high for H. taichui with an average of 7691 specimens per infected person, followed by H. yokogawai (8.3 specimens) and H. pumilio (4.1 specimens). Out of 207 freshwater fish (17 species) purchased in a market in Luang Prabang District, 138 (67%) harboured H. taichui metacercariae (metacercarial burden per fish; 520). Lower prevalence of fish and lower metacercarial density were observed for H. yokogawai (52% and 50 per fish, respectively) and H. pumilio (18% and 3 per fish, respectively). STE found in the surveyed population of Luang Prabang Province were verified to be those of intestinal fukes, particularly H. taichui.
채종일,정봉광,장태희,신혜주,손운목,Keeseon S. Eom,용태순,Duk-Young Min,Bounlay Phammasack,Bounnaloth Insisiengmay,임한종 대한기생충학ㆍ열대의학회 2020 The Korean Journal of Parasitology Vol.58 No.1
Human infection with Echinostoma aegyptica Khalil and Abaza, 1924 (Trematoda: Echinostomatidae) is extremely rare. In this study, we confirmed E. aegyptica infection in 5 riparian residents living along the Mekong River in Savannakhet Province, Lao PDR. The patients revealed eggs of Opisthorchis viverrini/minute intestinal flukes, echinostomes, and other parasites in fecal examinations using the Kato-Katz technique. Following treatment with praziquantel 30-40 mg/kg and pyrantel pamoate 10-15 mg/kg in a single dose and purging with magnesium salts, adult specimens of various helminth species were collected. Among the trematodes, echinostome flukes of 4.5-7.6 mm in length (n = 134; av. 22.3 specimens per case) were of taxonomic interest and subjected in this study. The flukes were morphologically characterized by having total 43-45 collar spines arranged in 2 alternating rows (corner spines usually 5 on each side) and compatible with previous descriptions of E. aegyptica. The patients were mixed-infected with other helminths, so specific clinical manifestations due to this echinostome fluke were difficult to determine. The present paper describes for the first time human E. aegyptica infections in Lao PDR. This is the second report of human infection (2nd-6th cases) with E. aegyptica in the world following the first one from China.
Jong-Yil Chai,장태희,정봉광,신혜주,손운목,Keeseon S. Eom,용태순,Duk-Young Min,Bounlay Phammasac,Bounnaloth Insisiengmay,임한종 대한기생충학ㆍ열대의학회 2019 The Korean Journal of Parasitology Vol.57 No.4
Adult specimens of Echinochasmus caninus n. comb. (Verma, 1935) (Trematoda: Echinostomatidae) (syn. Episthmium caninum Yamaguti, 1958) were recovered from 11 riparian people who resided along the Mekong River in Khammouane Province, Lao PDR. In fecal examinations done by the Kato-Katz technique, the cases revealed eggs of Opisthorchis viverrini/minute intestinal flukes, hookworms, and in 2 cases echinostome eggs. To recover the adult hel- minths, praziquantel 30-40 mg/kg and pyrantel pamoate 10-15 mg/kg in a single dose were given and purged with mag- nesium salts. Various species of trematodes (including O. viverrini and Haplorchis spp.), cestodes, and nematodes were recovered from their diarrheic stools. Among the trematodes, small echinostome flukes (n=42; av. 3.8 specimens per case) of 0.7-1.2 mm in length are subjected in this study. They are morphologically characterized by having 24 collar spines interrupted dorsally and anterior extension of vitellaria from the cirrus sac or genital pore level to the posterior end of the body. Particularly based on this extensive distribution of vitellaria, the specific diagnosis was made as Echinochas- mus caninus. The cases were co-infected with various other helminth parasites; thus, clinical manifestations specific for this echinostome infection were difficult to determine. The present paper describes for the first time human E. caninus in- fections in Lao PDR. Our cases marked the 4-14th human infections with this echinostome around the world following the 3 previous cases reported from Thailand.
Echinostoma ilocanum Infection in Two Residents of Savannakhet Province, Lao PDR
Jong-Yil Chai,Woon-Mok Sohn,Jaeeun Cho,Keeseon S. Eom,Tai-Soon Yong,Duk-Young Min,Eui-Hyug Hoang,Bounlay Phommasack,Bounnaloth Insisiengmay,Han-Jong Rim 대한기생충학열대의학회 2018 The Korean Journal of Parasitology Vol.56 No.1
Adult specimens of Echinostoma ilocanum (Garrison, 1908) Odhner, 1911 (Trematoda: Echinostomatidae) were recovered from 2 riparian people who resided along the Mekong River in Savannakhet Province, Lao PDR. In fecal examinations done by the Kato-Katz technique, they revealed echinostome eggs together with eggs of Opisthorchis viverrini (and minute intestinal fluke eggs) and hookworms. To recover the adult flukes, they were treated with praziquantel 30-40 mg/kg in a single dose and purged with magnesium salts. A total of 658 adult fluke specimens were recovered from the 2 people; 456 from case 1 and 202 from case 2. Specimens from case 1 consisted of 335 echinostomes (301 E. ilocanum and 34 species undetermined), 120 O. viverrini, and 1 Haplorchis taichui, and those from case 2 consisted of 36 E. ilocanum, 134 O. viverrini, and 32 H. taichui. Thus, the number of E. ilocanum specimens was 337 in total (average per person, 168.5). From this study, it is suggested that foodborne intestinal flukes and liver flukes are highly prevalent along the Mekong River in Savannakhet Province. The present report describes for the first time human infections with E. ilocanum in Lao PDR.