PMC:7115396 / 6139-6487 JSONTXT

{"project":"LitCovid-PubTator","denotations":[{"id":"100","span":{"begin":242,"end":245},"obj":"Species"},{"id":"101","span":{"begin":272,"end":275},"obj":"Species"}],"attributes":[{"id":"A100","pred":"tao:has_database_id","subj":"100","obj":"Tax:11120"},{"id":"A101","pred":"tao:has_database_id","subj":"101","obj":"Tax:11120"}],"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":"assaged attenuated vaccine strain, which may not be able to effectively solved the loss problem caused by the rapid variation exhibited by prevalent strains on the flocks.\nIn considering the limitations of the live attenuated and inactivated IBV vaccines, reverse genetic IBV vaccines have been developed in recent years as they display increased s"}