PMC:7519301 / 192-334 JSONTXT

{"project":"LitCovid-PD-CLO","denotations":[{"id":"T3","span":{"begin":9,"end":10},"obj":"http://purl.obolibrary.org/obo/CLO_0001020"},{"id":"T4","span":{"begin":46,"end":51},"obj":"http://purl.obolibrary.org/obo/NCBITaxon_10239"},{"id":"T5","span":{"begin":66,"end":67},"obj":"http://purl.obolibrary.org/obo/CLO_0001020"}],"text":"ility of a universally effective vaccine. The virus can mutate in a given individual, and these variants can be propagated across populations "}