Emergent virus
Recent examples include the SARS-related coronaviruses , which have caused the 2002-2004 outbreak of SARS ( SARS-CoV-1 ) and the 2019–20 pandemic of COVID-19 ( SARS-CoV-2 ) . 
<triplet> SARS-related coronavirus <subj> COVID-19 <obj> has effect <triplet> 2002-2004 outbreak <subj> SARS <obj> has cause <triplet> SARS <subj> 2002-2004 outbreak <obj> has effect <subj> SARS-CoV-1 <obj> has cause <triplet> SARS-CoV-1 <subj> SARS-related coronavirus <obj> parent taxon <subj> SARS <obj> has effect <triplet> 2019–20 pandemic <subj> SARS-CoV-2 <obj> has cause <triplet> COVID-19 <subj> 2019–20 pandemic <obj> has effect <subj> SARS-CoV-2 <obj> has cause <triplet> SARS-CoV-2 <subj> SARS-related coronavirus <obj> parent taxon <subj> 2019–20 pandemic <obj> has effect <subj> COVID-19 <obj> has effect