Objectives Kudoa septempunctata is a marine myxosporean parasite implicated in seafood-borne acute gastroenteritis, predominantly associated with the consumption of raw olive flounder. This study aimed to characterize the molecular and genetic features of K. septempunctata-associated with foodborne outbreaks in the Republic of Korea from 2016 to 2024. Methods: We reviewed 415 suspected foodborne outbreaks reported through national surveillance between 2016 and 2024. Among these, 37 outbreaks with complete clinical, epidemiological, and laboratory data from 2020 to 2024—including K. septempunctata testing and genotyping—were analyzed in detail. Results: Diarrhea (88.8%) and vomiting (61.2%) were the most common symptoms. The detection rate of K. septempunctata was significantly higher in specimens collected ≤24 hours after raw fish consumption (69.8%) than in those collected > 24 hours after consumption (35.9%). Outbreak occurrence was higher during warmer months (May–October) than during other periods, although this difference was not statistically significant. All sequences obtained from patient specimens belonged to sequence type 3 (ST3) of K. septempunctata. Conclusion: Since 2020, the proportion of reported outbreaks associated with Kudoa has increased, indicating its continued public health relevance. The timing of specimen collection is a key determinant of K. septempunctata detection, as diagnostic yield declines significantly when specimens are collected more than 24 hours after exposure. These findings highlight the need for standardized rapid investigation protocols and an integrated surveillance system linking clinical data with seafood supply-chain information.
Objectives The aim of this study was to compare the rate of parasitism and intestinal parasitism profiles of children who live in relatively proximal communities across the 5 municipalities of the Barranquilla metropolitan area, Colombia.
Methods In total, 986 fecal samples from children aged 1 to 10 were analyzed using a direct method (physiological saline and lugol) and the zinc sulfate flotation technique. A comparative analysis of the parasitism profiles between sampling locations (7 schools and 3 health centers providing growth and development services) was conducted using principal component analysis (PCA). The presence of Taenia solium antibodies was evaluated by the enzyme-linked immunosorbent assay method in 269 serum samples from the same group of children.
Results The overall prevalence of intestinal parasitism was 57.6% (range, 42.1%–77.6%) across the sampling areas. The prevalence of helminthiasis was between 4.1% and 23.7%, and that of intestinal protozoa was between 38.2% and 73.5%. PCA showed that the parasite profiles of each sampling location shared no common characteristics. A total of 3.0% of the serum samples were positive for T. solium antibodies.
Conclusion The intestinal parasitism profiles between relatively proximal sampling locations with similar geographic conditions were vastly different, indicating the need to study each small ecological niche on a localized scale to develop more cost-effective interventions for controlling intestinal parasitism.
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María de la Luz Galván-Ramírez, Ana Luisa Madriz-Elisondo, Cynthia Guadalupe Temores Ramírez, Jorge de Jesús Romero Rameño, Dania Araceli de la O Carrasco, Marco Antonio Cardona López
Osong Public Health Res Perspect 2019;10(1):39-48. Published online February 28, 2019
<sec>
<title>Objectives</title>
<p>To determine the prevalence and risk factors associated with intestinal parasites in the population of San Juan Cosala, Jalisco, Mexico.</p></sec>
<sec>
<title>Methods</title>
<p>A total of 277 samples from 104 participants were analysed using direct smear, flotation, formaldehyde/ethyl acetate, and modified Kinyoun’s acid-fast stain methods. The Graham method was applied only for samples from children under 12 years of age for the diagnosis of<italic> Enterobius vermicularis.</italic></p></sec>
<sec>
<title>Results</title>
<p>The prevalence of parasite infections in the study population was 77.9% including:<italic> Entamoeba histolytica/E. dispar/E. moshkovskii/E. bangladeshi</italic> (37.5%),<italic> Giardia intestinalis</italic> (11.5%);<italic> commensals: Endolimax nana</italic> (44.2%),<italic> Entamoeba coli</italic> (27.9%),<italic> Chilomastix mesnili</italic> (6.7%) and<italic> Iodamoeba bütschlii</italic>, (2.9%); emerging intestinal protozoans:<italic> Blastocystis</italic> spp. (49%),<italic> Cryptosporidium</italic> spp. (7.7%) and <italic>Cyclospora cayetanensis</italic> (2.9%); and helminths:<italic> Enterobius vermicularis</italic> (18.3%) and <italic>Ascaris lumbricoides</italic> (5.8%). The results also showed that 58.64% of the studied population presented polyparasitism. A significant association was found between protozoan infections and housewives, and houses that were not built with concrete ceilings, brick walls and cement floors (<italic>p</italic> < 0.05).</p></sec>
<sec>
<title>Conclusion</title>
<p>Polyparasitism was observed in over half the study population. The most prevalent parasite was <italic>Blastocystis</italic> spp, whilst the prevalence of helminths was less than that of protozoans. The risk factors for infection to intestinal parasites were being a housewife and not having solid brick, cement and concrete materials for house construction.</p></sec>
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<sec>
<title>Objectives</title>
<p><italic>Leishmania</italic> parasites are the causative agents of leishmaniasis. The Visceral leishmaniasis (VL) form of the disease is fatal if not treated in most cases. This study examined the epidemiological aspects of VL in two southwest counties of Iran.</p></sec>
<sec>
<title>Methods</title>
<p>This was a retrospective study of hospitalized patients with a laboratory confirmation of VL from Larestan and Ghiro-Karzin Counties.</p></sec>
<sec>
<title>Results</title>
<p>For Larestan county, a decline in the incidence of VL has been observed from 2004 to 2015. Significantly more males (<italic>n</italic> = 14) than females (<italic>n</italic> = 6) were infected with VL in this county (<italic>p</italic> < 0.05), >95% of cases in children under 5 years of age. In Ghiro-Karzin county, the results were similar to a decline in VL infection from 2004 to 2015, and slightly more males (<italic>n</italic> = 14) than females (<italic>n</italic> = 11). Similarly, the majority of the patients infected with VL were children under 5 years old (88%).</p></sec>
<sec>
<title>Conclusion</title>
<p>The results from this study indicate that although the incidence of VL infection has reduced over time, VL was more prevalent in boys under 5 years old, suggesting that more attention to controlling the parasite and its vector are required.</p></sec>
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<sec><title>Objectives</title><p>Schoolchildren in developing countries are at greater risk of intestinal parasitic infections. This study aimed to estimate the prevalence and assess the risk factors of intestinal parasite infection among schoolchildren in rural areas of Peru.</p></sec><sec><title>Methods</title><p>A volunteer team from the Korea International Cooperation Agency (KOICA) conducted a campaign for parasite eradication called “Chao parasitos” at five schools in the peripheral highland regions of Huanuco in October 2013. The study collected questionnaires and stool samples from children of participating schools. <italic>Entamoeba coli</italic>, <italic>Iodamoeba buschii</italic>, and <italic>Chilomastix mesnil</italic> were classified as nonpathogenic parasites.</p></sec><sec><title>Results</title><p>The overall prevalence of intestinal parasite infection in the students was 100% (185/185). Among them, 25.9% (48/185) were infected only with nonpathogenic parasites whereas 74.1% (137/185) were infected with at least one pathogenic parasite. <italic>Ascaris lumbricoides</italic> was the most commonly detected (37.3%, 69/185), followed by <italic>Giardia lamblia</italic> (15.1%, 28/185) and <italic>I. buschii</italic> (11.9%, 22/185). Among lifestyle practices associated with parasitic infection, the rate of washing hands before meals was significantly lower in the students with pathogenic parasites compared to those with nonpathogenic parasites (77.4%, 106/137 vs. 93.8%, 45/48, <italic>p</italic> = 0.025).</p></sec><sec><title>Conclusion</title><p>The prevalence of intestinal parasite was 100%. Both personal hygiene and water supply facilities are required to eradicate parasite infection in rural areas of Peru.</p></sec>
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Objectives
The prevalence of <i>Clonorchis sinensis</i> infection was investigated among residents of the five major river basins, that is, Hangang, Nakdonggang, Seomjingang, Yeongsangang, and Geumgang River basins in Korea. Methods
From January to December 2007, a total of 31,268 stool samples were collected from 29 localities and examined by the formalin-ether sedimentation technique. Results
Intestinal parasite eggs and/or protozoan cysts were detected from 2957 (9.5%) inhabitants. Number of residents harbouring helminth eggs in the faeces was 2542 (8.1%) for <i>C. sinensis</i>, 255 (0.8%) for <i>Heterophyes</i> spp., 36 (0.1%) for <i>Echinostoma</i> spp., 30 (0.1%) for <i>Trichuris trichiura</i>, 8 (0.03%) for <i>Ascaris lumbricoides</i>, 7 (0.02%) for <i>Gymnophalloide seoi</i>, and 50 (0.02%) for <i>Trichostrongylus orientalis</i>. Number of residents harbouring protozoan cysts in the faeces was 133 (1.3%) for <i>Entamoeba</i> spp. and 50 (0.2%) for <i>Giardia lamblia.</i> The positive rates of <i>C. sinensis</i> in Nakdonggang, Seomjingang, Yeongsangang, Geumgang, and Hangang River basins were 12.2%, 9.5%, 3.3%, 3.0%, and 1.0%, respectively. The egg positive rate of <i>C. sinensis</i> was higher in male (10.6%) than in female (6.1%), and the age group of 50s had the highest positive rate (10.4%). Conclusion
The result of this study revealed little decrease in positive rate of <i>C. sinensis</i> compared with the result of southern endemic areas of Korea in 2006.
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