Inactivation of single-celled Ascaris suum eggs by low-pressure UV radiation

Applied and Environmental Microbiology
Sarah A Brownell, K L Nelson

Abstract

Intact and decorticated single-celled Ascaris suum eggs were exposed to UV radiation from low-pressure, germicidal lamps at fluences (doses) ranging from 0 to 8,000 J/m2 for intact eggs and from 0 to 500 J/m2 for decorticated eggs. With a UV fluence of 500 J/m2, 0.44-+/-0.20-log inactivation (mean+/-95% confidence interval) (63.7%) of intact eggs was observed, while a fluence of 4,000 J/m2 resulted in 2.23-+/-0.49-log inactivation (99.4%). (The maximum quantifiable inactivation was 2.5 log units.) Thus, according to the methods used here, Ascaris eggs are the most UV-resistant water-related pathogen identified to date. For the range of fluences recommended for disinfecting drinking water and wastewater (200 to 2,000 J/m2), from 0- to 1.5-log inactivation can be expected, although at typical fluences (less than 1,000 J/m2), the inactivation may be less than 1 log. When the eggs were decorticated (the outer egg shell layers were removed with sodium hypochlorite, leaving only the lipoprotein ascaroside layer) before exposure to UV, 1.80-+/-0.32-log reduction (98.4%) was achieved with a fluence of 500 J/m2, suggesting that the outer eggshell layers protected A. suum eggs from inactivation by UV radiation. This protection may have b...Continue Reading

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Citations

Nov 9, 2010·Applied and Environmental Microbiology·Michael A ButkusMichael P Labare
May 8, 2014·PloS One·Aurelie JeandronMita E Sengupta
Oct 17, 2013·Transactions of the Royal Society of Tropical Medicine and Hygiene·Adedotun A Adenusi, Thomas O S Adewoga
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Mar 14, 2014·The Korean Journal of Parasitology·Yong-Man YuYoung-Ha Lee
May 10, 2017·Parasitology·Sundar ThapaHelena Mejer
Aug 24, 2018·Journal of Medical Entomology·Daniele L DallavecchiaAcácio G Rodrigues
Mar 28, 2017·Applied and Environmental Microbiology·Sydney P RudkoPatrick C Hanington
Sep 20, 2019·PLoS Neglected Tropical Diseases·Lucinda HazellMichael R Templeton
Nov 21, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Vivek B RavindranAndrew S Ball
Nov 17, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Isaac Dennis AmoahThor Axel Stenström
Feb 23, 2019·PLoS Neglected Tropical Diseases·Vivek B RavindranAndrew S Ball
Dec 5, 2017·Journal of Water, Sanitation, and Hygiene for Development : a Journal of the International Water Association·D Naidoo, G L Foutch
Jul 7, 2021·PLoS Neglected Tropical Diseases·Lucinda HazellMichael R Templeton

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