PMC:7787218 / 5645-5821 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T20","span":{"begin":0,"end":176},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"The occurrence on first exposure is not typical of IgE-mediated reactions; however, preexisting sensitization to a component of the vaccine could account for this observation.4"}