polyethylene glycol is a polyether compound derived from petroleum with many applications, from industrial manufacturing to medicine. PEG is also known as polyethylene oxide (PEO) or polyoxyethylene (POE), depending on its molecular weight. The structure of PEG is commonly expressed as H−(O−CH2−CH2)n−OH. PEGs are also used in everyday products such as toothpaste and shampoo as thickeners, solvents, softeners, and moisture carriers, and they’ve been used as a laxative for decades. An increasing number of biopharmaceuticals include PEGylated compounds as well vaccine, COVID-19, allergic reaction The American College of Allergy, Asthma and Immunology (ACAAI) has updated their guidelines regarding the risk of allergic reactions following administration of the COVID-19 vaccine now include information on screenings, observation periods, and the option of forgoing the second dose following a documented allergic reaction from the first dose. The ACAAI’s COVID-19 Vaccine Task...