PMC:7126544 / 5223-5332 JSONTXT

{"project":"LitCovid-PD-CLO","denotations":[{"id":"T50","span":{"begin":76,"end":77},"obj":"http://purl.obolibrary.org/obo/CLO_0001020"}],"text":"Most of the time they are associated with mild disease, but every few years a highly virulent strain appears."}

{"project":"LitCovid-sentences","denotations":[{"id":"T45","span":{"begin":0,"end":109},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"Most of the time they are associated with mild disease, but every few years a highly virulent strain appears."}