PMC:7269710 / 22079-22238 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T210","span":{"begin":0,"end":159},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Although the primary case or cases in all three clusters cannot be conclusively identified, they are postulated to be tourists or business visitors from China."}