RT Journal Article SR Electronic T1 Anaphylaxis following enteral exposure to Chlorella vulgaris JF BMJ Case Reports JO BMJ Case Reports FD BMJ Publishing Group Ltd SP e237054 DO 10.1136/bcr-2020-237054 VO 13 IS 11 A1 Abasszade, Joshua Haron A1 Rama Raj, Palaniraj A1 Tinson, Alistair John YR 2020 UL http://casereports.bmj.com/content/13/11/e237054.abstract AB We present a case of a 75-year-old man who was admitted to an Australian tertiary emergency department with severe hypotension, wheeze, widespread urticarial rash and diarrhoea. On arrival to the emergency department following initial resuscitation by ambulance staff, he was admitted to the intensive care unit with a presumptive diagnosis of gastroenteritis. This diagnosis was later revised following the availability of tryptase levels and clarification of his presenting circumstances, which established a clear temporal relationship between his anaphylactoid symptoms and the oral ingestion of Chlorella vulgaris supplements. While there are a few case studies describing allergic/anaphylactic reactions to several other species of Chlorella, this appears to be the first reported case of anaphylaxis to C. vulgaris.