A compound attribute that is the ratio of amount of mitochondrial antiviral-signaling protein (human) in blood to amount of mediator of RNA polymerase II transcription subunit 18 (human) in blood. The trait is MAVS/MED18 protein level ratio in blood (OBA_2053895, an Ontology of Biological Attributes entry). Also known as: the ratio of amount of mitochondrial antiviral-signaling protein (human) in blood to amount of mediator of RNA polymerase II transcription subunit 18 (human) in blood.