| viral hemorrhagic septicemia ivb status in the united states: inferences from surveillance activities and regional context. | the united states (u.s.) response to viral hemorrhagic septicemia virus (vhsv) ivb emergence in the laurentian great lakes (gl) included risk-based surveillance for cost-effective decision support regarding the health of fish populations in open systems. all u.s. vhsv ivb isolations to date derive from free-ranging fish from gl states. most originate in the region designated by us geological survey hydrologic unit code (huc) 04, with the exception of two detections in neighboring upper mississip ... | 2014 | 24655577 |