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Substitution of the D7 reading with a photo may be a valid option.<\/jats:p><\/jats:sec><jats:sec><jats:title>Objectives<\/jats:title><jats:p>To compare the sensitivity of digital photos at D7 to clinical readings, to assess the number of positive reactions appearing at D7 only (late reactions), and after D7 only (delayed reactions).<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Patients patch tested in six European clinics were instructed to forward photos of the patch test reactions to the respective clinics at D7 (before attending the clinic) and at D21. Only allergens in the baseline series or TRUE Test were included in the data analysis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Two hundred ninety\u2010three of 629 patients had a total of 599 positive reactions, with 6.3% occurring at D7 only. When substituting the D7 reading with a photo (90% submitted), 26.3% of late reactions were missed and nine false\u2010positive reactions were found. Delayed reactions were detected in four patients at D21 (65.3% submitted).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Our data show that if the D7 reading is not performed, 6.3% of positive reactions from the baseline series would be missed, and if substituting the D7 reading by digital photo, 26.3% late reactions would be missed. Delayed reactions seemed rare.<\/jats:p><\/jats:sec>","DOI":"10.1111\/cod.13736","type":"journal-article","created":{"date-parts":[[2020,11,5]],"date-time":"2020-11-05T17:14:31Z","timestamp":1604596471000},"page":"283-289","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Value of photo assessment in late patch test readings\u2014A multicenter study from six European patch test clinics"],"prefix":"10.1111","volume":"84","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1289-1827","authenticated-orcid":false,"given":"Yasemin T.","family":"Y\u00fcksel","sequence":"first","affiliation":[{"name":"Department of Dermatology Bispebjerg Hospital, University of Copenhagen  Copenhagen Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4279-0149","authenticated-orcid":false,"given":"Farnam B.","family":"Sedeh","sequence":"additional","affiliation":[{"name":"Department of Dermatology Bispebjerg Hospital, University of Copenhagen  Copenhagen Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1245-024X","authenticated-orcid":false,"given":"Richard","family":"Brans","sequence":"additional","affiliation":[{"name":"Department of Dermatology, Environmental Medicine and Health Theory University of Osnabr\u00fcck  Osnabr\u00fcck Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4797-0269","authenticated-orcid":false,"given":"Cecilia","family":"Svedman","sequence":"additional","affiliation":[{"name":"Department of Occupational Dermatology University of Lund, Sk\u00e5ne University Hospital  Malm\u00f6 Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9738-6613","authenticated-orcid":false,"given":"Evy","family":"Paulsen","sequence":"additional","affiliation":[{"name":"Department of Dermatology and Allergy Centre Odense University Hospital, University of Southern Denmark  Odense Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5434-7753","authenticated-orcid":false,"given":"Ana","family":"Gimen\u00e9z\u2010Arnau","sequence":"additional","affiliation":[{"name":"Department of Dermatology Hospital del Mar, IMIM, Universitat Aut\u00f2noma de Barcelona  Barcelona Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6196-9788","authenticated-orcid":false,"given":"Caterina","family":"Foti","sequence":"additional","affiliation":[{"name":"Department of Biomedical Science and Human Oncology, Dermatological Clinic University of Bari  Bari Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7543-8299","authenticated-orcid":false,"given":"Tove","family":"Agner","sequence":"additional","affiliation":[{"name":"Department of Dermatology Bispebjerg Hospital, University of Copenhagen  Copenhagen Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"name":"The EECDRG","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2020,11,20]]},"reference":[{"issue":"3","key":"e_1_2_9_2_1","first-page":"157","article-title":"The patch test\u2010 its use in dermatology. 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