Parasites, Hosts and Diseases

"Yong-Man Yu"

Brief Communications

Effects of Some Pesticides on Development of Ascaris suum Eggs: Yong-Man Yu, Jin-Won Kim, Won-Seok Na, Young-Nam Youn, In-Wook Choi, Young-Ha Lee; Korean J Parasitol 2014;52(1):111-115.
Published online February 19, 2014; DOI: https://doi.org/10.3347/kjp.2014.52.1.111

Abstract
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To evaluate the effects of pesticides to parasite eggs, Ascaris suum eggs were incubated with 5 different pesticides (1:1,500-1:2,000 dilutions of 2% emamectin benzoate, 5% spinetoram, 5% indoxacarb, 1% deltamethrin, and 5% flufenoxuron; all v/v) at 20℃ for 6 weeks, and microscopically evaluated the egg survival and development on a weekly basis. The survival rate of A. suum eggs incubated in normal saline (control eggs) was 90±3% at 6 weeks. However, the survival rates of eggs treated with pesticides were 75-85% at this time, thus significantly lower than the control value. Larval development in control eggs commenced at 3 weeks, and 73±3% of eggs had internal larvae at 6 weeks. Larvae were evident in pesticide-treated eggs at 3-4 weeks, and the proportions of eggs carrying larvae at 6 weeks (36±3%-54±3%) were significantly lower than that of the control group. Thus, pesticides tested at levels similar to those used in agricultural practices exhibited low-level ovicidal activity and delayed embryogenesis of A. suum eggs, although some differences were evident among the tested pesticides.

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Investigating cement-based surfaces as a sustainable flooring solution to improve Ascaris Suum egg removal and inactivation in low-resource settings
Claire E. Anderson, Suhi Hanif, Jason Hernandez, Yoshika Crider, Michael Lepech, Sarah L. Billington, Alexandria B. Boehm, Jade Benjamin-Chung, Vito Colella,
PLOS Neglected Tropical Diseases.2025; 19(10): e0012919. CrossRef
Emamectin benzoate exposure impaired porcine oocyte maturation
Xin Wang, Mengya Zhang, Danruo Zhang, Yelian Yan, Qiuchen Liu, Changzhi Xu, Zhihua Zhu, Sucheng Wu, Yanfeng Zong, Zubing Cao, Yunhai Zhang
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PLOS ONE.2019; 14(5): e0217551. CrossRef

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Quantitative Evaluation of Viability- and Apoptosis-Related Genes in Ascaris suum Eggs under Different Culture-Temperature Conditions: Yong-Man Yu, You-Hang Cho, Young-Nam Youn, Juan Hua Quan, In-Wook Choi, Young-Ha Lee; Korean J Parasitol 2012;50(3):243-247.
Published online August 13, 2012; DOI: https://doi.org/10.3347/kjp.2012.50.3.243

Abstract
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Ascaris suum eggs are inactivated by composting conditions; however, it is difficult to find functional changes in heat-treated A. suum eggs. Here, unembryonated A. suum eggs were incubated at 20℃, 50℃, and 70℃ in vitro, and the gene expression levels related to viability, such as eukaryotic translation initiation factor 4E (IF4E), phosphofructokinase 1 (PFK1), and thioredoxin 1 (TRX1), and to apoptosis, such as apoptosis-inducing factor 1 (AIF1) and cell death protein 6 (CDP6), were evaluated by real-time quantitative RT-PCR. No prominent morphological alterations were noted in the eggs at 20℃ until day 10. In contrast, the eggs developed rapidly, and embryonated eggs and hatched larvae began to die, starting on day 2 at 50℃ and day 1 at 70℃. At 20℃, IF4E, PFK1, and TRX1 mRNA expression was significantly increased from days 2-4; however, AIF1 and CDP6 mRNA expression was not changed significantly. IF4E, PFK1, and TRX1 mRNA expression was markedly decreased from day 2 at 50℃ and 70℃, whereas AIF1 and CDP6 mRNA expression was significantly increased. The expressions of HSP70 and HSP90 were detected for 9-10 days at 20℃, for 3-5 days at 50℃, and for 2 days at 70℃. Taken together, incremental heat increases were associated with the rapid development of A. suum eggs, decreased expression of genes related to viability, and earlier expression of apoptosis-related genes, and finally these changes of viability- and apoptosis-related genes of A. suum eggs were associated with survival of the eggs under temperature stress.

Citations

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Environmental Science and Pollution Research.2025; 32(17): 10688. CrossRef
Investigating cement-based surfaces as a sustainable flooring solution to improve Ascaris Suum egg removal and inactivation in low-resource settings
Claire E. Anderson, Suhi Hanif, Jason Hernandez, Yoshika Crider, Michael Lepech, Sarah L. Billington, Alexandria B. Boehm, Jade Benjamin-Chung, Vito Colella,
PLOS Neglected Tropical Diseases.2025; 19(10): e0012919. CrossRef
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Veterinary Parasitology.2015; 212(3-4): 281. CrossRef
Effects of Some Pesticides on Development of Ascaris suum Eggs
Yong-Man Yu, Jin-Won Kim, Won-Seok Na, Young-Nam Youn, In-Wook Choi, Young-Ha Lee
The Korean Journal of Parasitology.2014; 52(1): 111. CrossRef

9,223 View
69 Download
Crossref

Intestinal Parasite Infections in Pigs and Beef Cattle in Rural Areas of Chungcheongnam-do, Korea: Hassan Ahmed Hassan Ahmed Ismail, Hyung-Kyu Jeon, Yong-Man Yu, Changhee Do, Young-Ha Lee; Korean J Parasitol 2010;48(4):347-349.
Published online December 16, 2010; DOI: https://doi.org/10.3347/kjp.2010.48.4.347

Abstract
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The present study was performed to investigate the infection status of intestinal parasites in pigs and beef cattle in rural areas of Chungcheongnam-do, Korea. From November 2009 to April 2010, a total of 241 fecal samples of pigs and beef cattle (136 and 105, respectively) were examined by direct smear and centrifugal sedimentation methods. The overall positive rates of intestinal parasites among pigs and beef cattle were 73.5% and 4.8%, respectively, and the double-infection rate was 10.3% in pigs. Of 136 specimens from pigs, Balantidium coli, Ascaris suum, and Entamoeba spp. infections were found in 88 (64.7%), 24 (17.6%), and 5 cases (3.7%), respectively. Of 105 beef cattle, Entamoeba spp. infections were detected in 5 cases (4.8%). From these results, it is shown that pigs raised on rural farms in Chungcheongnam-do had a high B. coli infection rate and a moderate A. suum infection rate. These results demonstrate that environmentally resistant cysts or eggs could be widespread on the farms examined, and thus an effective hygienic management system is needed to prevent them from serving as the source of infection for human beings.

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