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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>
Egg Laying Capacity of Haplorchis taichui (Digenea: Heterophyidae) in Humans
Megumi Sato,Surapol Sanguankiat,Somchit Pubampen,Teera Kusolsuk,Wanna Maipanich,Jitra Waikagul 대한기생충학열대의학회 2009 The Korean Journal of Parasitology Vol.47 No.3
Quantitative fecal egg counts represented as the number of eggs per gram of feces (EPG) are generally a reliable parameter to estimate the worm burden of intestinal and hepatic parasitoses. Although Haplorchis taichui (Digenea: Heterophyidae) is one of the most common minute human intestinal flukes, little is known about the relationship between EPG and the actual worm burden in patients or the severity of the disease. In the present study, fecal samples were collected from 25 villagers in northern Thailand before and after praziquantel treatment. The EPG values of each participant were determined by the modified cellophane thick smear method, and adult worms were collected from the whole stool after the treatment. Eggs per day per worm (EPDPW) of H. taichui were estimated 82 from egg counts and expelled worms. The EPG was not well correlated with the worm burden, and a reverse correlation was observed between the EPDPW and the worm burden.