Study to Evalutate Long-term Immunity of Hantavax in High Risk Population of HFRS

Inclusion Criteria: * The subjects who have the vaccination history of ah the time of screening * The subjects whose Hantaan virus virus's antibody shows negative using Neutralizing antibody test at the time of screening Exclusion Criteria: * The subjects who have a history of hemorrhagic fever with renal syndrome * The subjects who have a fever or significant dystrophy