PMC:7551987 / 8797-9024 JSONTXT

{"project":"LitCovid-sentences","denotations":[{"id":"T55","span":{"begin":0,"end":227},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"This describes situations such as the evolution of novel viral lineages, viral spillover events, or host shifts, where a virus with a preexisting relationship between virulence and survival emerges in a population of new hosts."}