PMC:7558233 / 578-724 JSONTXT

{"project":"LitCovid-PubTator","denotations":[{"id":"21","span":{"begin":126,"end":135},"obj":"Disease"}],"attributes":[{"id":"A21","pred":"tao:has_database_id","subj":"21","obj":"MESH:D007239"}],"namespaces":[{"prefix":"Tax","uri":"https://www.ncbi.nlm.nih.gov/taxonomy/"},{"prefix":"MESH","uri":"https://id.nlm.nih.gov/mesh/"},{"prefix":"Gene","uri":"https://www.ncbi.nlm.nih.gov/gene/"},{"prefix":"CVCL","uri":"https://web.expasy.org/cellosaurus/CVCL_"}],"text":" vaccines. Despite these rapid scientific and technological advances, uncertainties remain in tracing the original sources of infection, determini"}