PMC:7784824 / 8441-8616 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T88","span":{"begin":0,"end":175},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"The collected sera were divided into 2 groups: day 2–7 after symptom onset (7 samples) and day 8–18 after symptom onset (16 samples) in order to evaluate clinical sensitivity."}