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  1. Article ; Online: Protozoan-Priming and Magnesium Conditioning Enhance

    Cambronne, Eric D / Ayres, Craig / Dowdell, Katherine S / Lawler, Desmond F / Saleh, Navid B / Kirisits, Mary Jo

    Environmental science & technology

    2023  Volume 57, Issue 40, Page(s) 14871–14880

    Abstract: Opportunistic pathogens (OPs) are of concern in drinking water distribution systems because they persist despite disinfectant residuals. While many OPs garner protection from disinfectants via a biofilm lifestyle, ...

    Abstract Opportunistic pathogens (OPs) are of concern in drinking water distribution systems because they persist despite disinfectant residuals. While many OPs garner protection from disinfectants via a biofilm lifestyle,
    MeSH term(s) Humans ; Legionella pneumophila/genetics ; Magnesium/pharmacology ; Water Microbiology ; Disinfectants/pharmacology ; Amoeba
    Chemical Substances chloramine (KW8K411A1P) ; Magnesium (I38ZP9992A) ; Disinfectants
    Language English
    Publishing date 2023-09-27
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ISSN 1520-5851
    ISSN (online) 1520-5851
    DOI 10.1021/acs.est.3c04013
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Biodegradation and attenuation of MIB and 2,4-D in drinking water biologically active sand and activated carbon filters

    Shimabuku, Kyle K. / Zearley, Thomas L / Dowdell, Katherine S. / Summers, R. Scott

    Environmental science : Water research & technology

    2019  Volume 5, Issue 5, Page(s) 849

    Language English
    Document type Article
    ZDB-ID 2833082-1
    ISSN 2053-1400
    Database Current Contents Nutrition, Environment, Agriculture

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    In stock of ZB MED Bonn / Germany

    Z 7947: Show issues

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  3. Article ; Online: Legionella pneumophila occurrence in reduced-occupancy buildings in 11 cities during the COVID-19 pandemic

    Dowdell, Katherine S / Greenwald, Hannah D / Joshi, Sayalee / Grimard-Conea, Marianne / Pitell, Sarah / Song, Yang / Ley, Christian / Kennedy, Lauren C / Vosloo, Solize / Huo, Linxuan / Haig, Sarah-Jane / Hamilton, Kerry A / Nelson, Kara / Pinto, Ameet J / Prevost, Michele / Proctor, Caitlin R / Raskin, Lutgarde / Whelton, Andrew J / Garner, Emily /
    Pieper, Kelsey J / Rhoads, William J.

    medRxiv

    Abstract: In spring 2020, reduced water demand was an unintended consequence of COVID-19 pandemic-related building closures. Concerns arose that contaminants associated with water stagnation, such as ... Legionella pneumophila ... , could become prevalent. To ... ...

    Abstract In spring 2020, reduced water demand was an unintended consequence of COVID-19 pandemic-related building closures. Concerns arose that contaminants associated with water stagnation, such as Legionella pneumophila, could become prevalent. To investigate this potential public health risk, samples from 26 reduced-occupancy buildings across 11 cities in the United States, Canada, and Switzerland were analyzed for L. pneumophila using liquid culture (Legiolert, n=258) and DNA-based methods (qPCR/ddPCR, n=138). L. pneumophila culture-positivity was largely associated with just five buildings, each of which had specific design or operational deficiencies commonly associated with L. pneumophila occurrence. Samples from free chlorine buildings had higher culture-positivity (37%) than chloramine buildings (1%), and 78% of culture-positive samples occurred when the residual was ≤0.1 mg/L Cl2. Although overall sample positivities using culture- and DNA-based methods were equivalent (34% vs. 35%), there was disagreement between the methods in 13% of paired samples. Few buildings reported any water management activities, and L. pneumophila concentrations in flushed samples were occasionally greater than in first-draw samples. This study provides insight into how building plumbing characteristics and management practices contribute to L. pneumophila occurrence during low water use periods and can inform targeted prevention and mitigation efforts.
    Keywords covid19
    Language English
    Publishing date 2022-06-29
    Publisher Cold Spring Harbor Laboratory Press
    Document type Article ; Online
    DOI 10.1101/2022.06.28.22277022
    Database COVID19

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