A compound attribute that is the ratio of amount of hepatitis A virus cellular receptor 2 (human) in blood to amount of paired immunoglobulin-like type 2 receptor alpha (human) in blood. The trait is HAVCR2/PILRA protein level ratio in blood (Ontology of Biological Attributes id OBA_2053086). Also known as: the ratio of amount of hepatitis A virus cellular receptor 2 (human) in blood to amount of paired immunoglobulin-like type 2 receptor alpha (human) in blood.