Etiology:  Hantaan virus is an enveloped RNA virus of the family Bunyaviridae.

Incidence:  Incidence of infection is rare in laboratory rats.

Transmission:  Transmission occurs by aerosol, contact with infected urine or feces or direct contact with the infected animal.

Clinical Signs:  Rats do not display clinical signs when infected with Hantaan virus.

Diagnosis: Diagnosis is made using serology (MFI, IFA) or PCR.

Public Health Significance:  Hantaan virus is zoonotic and can cause severe illness in humans.