PMC:7449695 / 5528-5624 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T38","span":{"begin":0,"end":96},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Contact tracing was initiated from 29 January 2020 and was performed by public health officials."}