Simultaneous detection of the protozoan parasites Toxoplasma, Cryptosporidium and Giardia in food matrices and their persistence on basil leaves

Toxoplasma gondii, Cryptosporidium spp. and Giardia intestinalis are emerging pathogen parasites in the food domain. However, without standardized methods for their detection in food matrices, parasitic foodborne outbreaks remain neglected. In this study, a new immunomagnetic separation assay (IMS T...

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Veröffentlicht in:Food microbiology 2016-08, Vol.57, p.36-44
Hauptverfasser: Hohweyer, Jeanne, Cazeaux, Catherine, Travaillé, Emmanuelle, Languet, Emilie, Dumètre, Aurélien, Aubert, Dominique, Terryn, Christine, Dubey, Jitender P., Azas, Nadine, Houssin, Maryline, Loïc, Favennec, Villena, Isabelle, La Carbona, Stéphanie
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container_issue
container_start_page 36
container_title Food microbiology
container_volume 57
creator Hohweyer, Jeanne
Cazeaux, Catherine
Travaillé, Emmanuelle
Languet, Emilie
Dumètre, Aurélien
Aubert, Dominique
Terryn, Christine
Dubey, Jitender P.
Azas, Nadine
Houssin, Maryline
Loïc, Favennec
Villena, Isabelle
La Carbona, Stéphanie
description Toxoplasma gondii, Cryptosporidium spp. and Giardia intestinalis are emerging pathogen parasites in the food domain. However, without standardized methods for their detection in food matrices, parasitic foodborne outbreaks remain neglected. In this study, a new immunomagnetic separation assay (IMS Toxo) targeting the oocyst's wall of T. gondii was developed using a specific purified monoclonal antibody. Performance of this IMS Toxo coupled to microscopic and qPCR analyses was evaluated in terms of limit of detection (LOD) and recovery rate (RR) on: i) simple matrix (LOD = 5 oocysts; RR between 5 and 56%); ii) raspberries and basil (LOD = 33 oocysts/g; RR between 0.2 and 35%). Finally, to simultaneously extract the three protozoa from these food matrices, T. gondii oocysts were directly concentrated (without IMS Toxo) from the supernatant of the IMS of Cryptosporidium and Giardia (oo)cysts. This strategy associated to qPCR detection led to LOD
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However, without standardized methods for their detection in food matrices, parasitic foodborne outbreaks remain neglected. In this study, a new immunomagnetic separation assay (IMS Toxo) targeting the oocyst's wall of T. gondii was developed using a specific purified monoclonal antibody. Performance of this IMS Toxo coupled to microscopic and qPCR analyses was evaluated in terms of limit of detection (LOD) and recovery rate (RR) on: i) simple matrix (LOD = 5 oocysts; RR between 5 and 56%); ii) raspberries and basil (LOD = 33 oocysts/g; RR between 0.2 and 35%). Finally, to simultaneously extract the three protozoa from these food matrices, T. gondii oocysts were directly concentrated (without IMS Toxo) from the supernatant of the IMS of Cryptosporidium and Giardia (oo)cysts. This strategy associated to qPCR detection led to LOD &lt;1 to 3 (oo)cysts/g and RR between 2 and 35%. This procedure was coupled to RT-qPCR analyses and showed that the three protozoa persisted on the leaves of basil and remained viable following storage at 4 °C for 8 days. These data strengthen the need to consider these protozoa in food safety. •A novel direct IMS capture of T. gondii oocysts is presented.•A new method to extract T. gondii, C. parvum, G. duodenalis (oo)cysts from food is proposed.•Recovery rates (2–35%) and limits of detection (≤3 (oo)cysts/g) are defined by qPCR.•Protozoa remain viable on the surface of basil for 8 days at 4 °C.</description><identifier>ISSN: 0740-0020</identifier><identifier>EISSN: 1095-9998</identifier><identifier>DOI: 10.1016/j.fm.2016.01.002</identifier><identifier>PMID: 27052700</identifier><language>eng</language><publisher>England: Elsevier Ltd</publisher><subject><![CDATA[Cryptosporidium ; Cryptosporidium - genetics ; Cryptosporidium - growth & development ; Cryptosporidium - isolation & purification ; Food Contamination - analysis ; Foods ; Fruits ; Giardia ; Giardia - genetics ; Giardia - growth & development ; Giardia - isolation & purification ; Giardia intestinalis ; Immunomagnetic separation ; Joining ; Life Sciences ; Microscopy ; Ocimum basilicum ; Ocimum basilicum - parasitology ; Oocysts - growth & development ; Parasites ; Persistence ; Plant Leaves - parasitology ; Protozoa ; Real-time qPCR ; Rubus - parasitology ; Strategy ; Toxoplasma - genetics ; Toxoplasma - growth & development ; Toxoplasma - isolation & purification ; Toxoplasma gondii ; Vegetables ; Viability ; Walls]]></subject><ispartof>Food microbiology, 2016-08, Vol.57, p.36-44</ispartof><rights>2016 Elsevier Ltd</rights><rights>Copyright © 2016 Elsevier Ltd. 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These data strengthen the need to consider these protozoa in food safety. •A novel direct IMS capture of T. gondii oocysts is presented.•A new method to extract T. gondii, C. parvum, G. duodenalis (oo)cysts from food is proposed.•Recovery rates (2–35%) and limits of detection (≤3 (oo)cysts/g) are defined by qPCR.•Protozoa remain viable on the surface of basil for 8 days at 4 °C.</description><subject>Cryptosporidium</subject><subject>Cryptosporidium - genetics</subject><subject>Cryptosporidium - growth &amp; development</subject><subject>Cryptosporidium - isolation &amp; purification</subject><subject>Food Contamination - analysis</subject><subject>Foods</subject><subject>Fruits</subject><subject>Giardia</subject><subject>Giardia - genetics</subject><subject>Giardia - growth &amp; development</subject><subject>Giardia - isolation &amp; purification</subject><subject>Giardia intestinalis</subject><subject>Immunomagnetic separation</subject><subject>Joining</subject><subject>Life Sciences</subject><subject>Microscopy</subject><subject>Ocimum basilicum</subject><subject>Ocimum basilicum - parasitology</subject><subject>Oocysts - growth &amp; 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Cazeaux, Catherine ; Travaillé, Emmanuelle ; Languet, Emilie ; Dumètre, Aurélien ; Aubert, Dominique ; Terryn, Christine ; Dubey, Jitender P. ; Azas, Nadine ; Houssin, Maryline ; Loïc, Favennec ; Villena, Isabelle ; La Carbona, Stéphanie</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c450t-dce9e732814c96d856cf0f167766aa9dad8f17e234dfda3a6fda5aaa7f0552da3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Cryptosporidium</topic><topic>Cryptosporidium - genetics</topic><topic>Cryptosporidium - growth &amp; development</topic><topic>Cryptosporidium - isolation &amp; purification</topic><topic>Food Contamination - analysis</topic><topic>Foods</topic><topic>Fruits</topic><topic>Giardia</topic><topic>Giardia - genetics</topic><topic>Giardia - growth &amp; development</topic><topic>Giardia - isolation &amp; purification</topic><topic>Giardia intestinalis</topic><topic>Immunomagnetic separation</topic><topic>Joining</topic><topic>Life Sciences</topic><topic>Microscopy</topic><topic>Ocimum basilicum</topic><topic>Ocimum basilicum - parasitology</topic><topic>Oocysts - growth &amp; 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However, without standardized methods for their detection in food matrices, parasitic foodborne outbreaks remain neglected. In this study, a new immunomagnetic separation assay (IMS Toxo) targeting the oocyst's wall of T. gondii was developed using a specific purified monoclonal antibody. Performance of this IMS Toxo coupled to microscopic and qPCR analyses was evaluated in terms of limit of detection (LOD) and recovery rate (RR) on: i) simple matrix (LOD = 5 oocysts; RR between 5 and 56%); ii) raspberries and basil (LOD = 33 oocysts/g; RR between 0.2 and 35%). Finally, to simultaneously extract the three protozoa from these food matrices, T. gondii oocysts were directly concentrated (without IMS Toxo) from the supernatant of the IMS of Cryptosporidium and Giardia (oo)cysts. This strategy associated to qPCR detection led to LOD &lt;1 to 3 (oo)cysts/g and RR between 2 and 35%. This procedure was coupled to RT-qPCR analyses and showed that the three protozoa persisted on the leaves of basil and remained viable following storage at 4 °C for 8 days. These data strengthen the need to consider these protozoa in food safety. •A novel direct IMS capture of T. gondii oocysts is presented.•A new method to extract T. gondii, C. parvum, G. duodenalis (oo)cysts from food is proposed.•Recovery rates (2–35%) and limits of detection (≤3 (oo)cysts/g) are defined by qPCR.•Protozoa remain viable on the surface of basil for 8 days at 4 °C.</abstract><cop>England</cop><pub>Elsevier Ltd</pub><pmid>27052700</pmid><doi>10.1016/j.fm.2016.01.002</doi><tpages>9</tpages><orcidid>https://orcid.org/0000-0002-7415-4198</orcidid></addata></record>
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subjects Cryptosporidium
Cryptosporidium - genetics
Cryptosporidium - growth & development
Cryptosporidium - isolation & purification
Food Contamination - analysis
Foods
Fruits
Giardia
Giardia - genetics
Giardia - growth & development
Giardia - isolation & purification
Giardia intestinalis
Immunomagnetic separation
Joining
Life Sciences
Microscopy
Ocimum basilicum
Ocimum basilicum - parasitology
Oocysts - growth & development
Parasites
Persistence
Plant Leaves - parasitology
Protozoa
Real-time qPCR
Rubus - parasitology
Strategy
Toxoplasma - genetics
Toxoplasma - growth & development
Toxoplasma - isolation & purification
Toxoplasma gondii
Vegetables
Viability
Walls
title Simultaneous detection of the protozoan parasites Toxoplasma, Cryptosporidium and Giardia in food matrices and their persistence on basil leaves
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