Anaphylactic reactions to polyethylene glycol-containing bowel cleansing preparations after Moderna COVID-19 vaccination

Shortly after emergency use authorization of COVID-19 mRNA vaccines was given, the first reports of anaphylactic reactions emerged. While the causative agent is still a matter of debate, allergy to the excipient polyethylene glycol (PEG) is a possible explanation [1]. PEG is a hydrophilic polymer with variable molecular weight and also the main constituent of many bowel cleansing agents used prior to colonoscopy. Anaphylaxis to PEG-containing...