PMC:7558233 / 42579-42705 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T253","span":{"begin":0,"end":126},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Four “inactivated virus vaccines” are in post-phase II clinical trials, and two of these have been approved for emergency use."}