https://w3id.org/framester/conceptnet5/data/en/viral_infection <https://w3id.org/framester/conceptnet5/schema/Causes> <https://w3id.org/framester/conceptnet5/data/en/become_ill> <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/infection> risorse dalla linked data cloud