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Freerk Prenzel1,2 *, Regina Treudler1,3 *, Tobias Lipek,1,2 Maike vom Hove,1,2 Paula Kage,1,3 Simone Kuhs,1,4 Thorsten Kaiser,1,4 Maximilian Bastl,5 Jan Bumberger,6– 8 Jon Genuneit,9,10 Thomas Hornick,8,11 Stefan Klotz,8,12 Julia Zarnowski,1,3 Maren Boege,1,13 Veit Zebralla,1,13 Jan-Christoph Simon,1,3 Susanne Dunker8,11 1Leipziger Interdisciplinary Center for Allergy (LICA), Comprehensive Allergy Center, Leipzig, Germany; 2University of Leipzig, Medical Center, Department of Pediatrics, Leipzig, Germany; 3University of Leipzig, Medical Center, Department of Dermatology, Venerology and Allergy, Leipzig, Germany; 4University of Leipzig, Medical Center, Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, Leipzig, Germany; 5Medical University of Vienna, Department of Otorhinolaryngology, Vienna, Austria; 6Helmholtz-Centre for Environmental Research (UFZ), Department Monitoring and Exploration Technologies, Leipzig, Germany; 7Helmholtz-Centre for Environmental Research (UFZ), Research Data Management, Leipzig, Germany; 8German Centre for Integrative Biodiversity Research (iDiv) Halle, Jena, Leipzig, Germany; 9Pediatric Epidemiology, Department of Pediatrics, Medical Faculty, Leipzig University, Leipzig, Germany; 10German Center for Child and Youth Health, Leipzig/ Dresden, Dresden, Germany; 11Helmholtz-Centre for Environmental Research (UFZ), Department Physiological Diversity, Leipzig, Germany; 12Helmholtz-Centre for Environmental Research (UFZ), Department Community Ecology, Halle, Germany; 13University of Leipzig, Medical Center, Department of Otorhinolaryngology, Head and Neck Surgery, Leipzig, Germany*These authors contributed equally to this workCorrespondence: Susanne Dunker, Helmholtz Centre for Environmental Research – UFZ, Leipzig, Germany, Tel +49 341 9733170, Email susanne.dunker@ufz.dePurpose: Ailanthus altissima is one of the world’s most invasive species with a globally problematic spread. Pollen i

Freerk Prenzel,1,2 Karl Nissler,3 Manuela Siekmeyer,1 Maike vom Hove,1,2 Gudrun Schleicher,4 Wieland Kiess,1 Tobias Lipek1,2 1Department of Pediatrics, University of Leipzig Medical Center, Leipzig, Germany; 2Leipzig Interdisciplinary Center for Allergy (LICA), Leipzig, Germany; 3Department of Pediatrics, Sana Hospitals Leipzig Region, Borna, Germany; 4Pediatric Medical Practice, Rötha, GermanyCorrespondence: Freerk PrenzelDepartment of Pediatrics, University of Leipzig Medical Center, Liebigstr. 20a, Leipzig 04179, GermanyTel +49 341 9726241Fax +49 341 9724119Email freerk.prenzel@uniklinik-leipzig.deAbstract: On our pediatric intensive care unit, we successfully treated a 10-year-old boy with severe pulmonary edema due to anaphylaxis after his last injection of a 3-year course of allergen immunotherapy (AIT). In view of the severity of the adverse event, we initiated a case analysis with all involved medical professionals. The evaluation revealed delayed administration of epinephrine due to dosing uncertainty and underestimation of severity. Consequently, all involved institutions established epinephrine auto-injectors (EAIs) in their emergency equipment. We suggest providing EAIs in every practice conducting AIT, as well as in pediatric emergency rooms and ambulances. We would like to remind readers of the risk of anaphylaxis, even on the last day of AIT.Keywords: epinephrine auto-injector, allergen immunotherapy, emergency equipment, house dust mite