PMC:7269710 / 802-964 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T12","span":{"begin":83,"end":119},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"ally to the first three clusters of circumscribed local transmission in Singapore. 425 close contacts were quarantined. Direct or prolonged close contact was repo"}