Sin Nombre virus belongs to which genus?

• A. Hantavirus
• B. Arenavirus
• C. Flavivirus
• D. Orthomyxovirus

Answer: (A)

Sin Nombre virus is classified as a hantavirus. Hantaviruses form a genus of rodent-borne, negative-sense RNA viruses that can cause serious disease in humans, most notably hantavirus pulmonary syndrome. The link to a specific rodent reservoir and the distinctive disease pattern help define this genus. The other groups listed belong to different virus families or genera—arenaviruses, flaviviruses, and orthomyxoviruses—so they are not the correct classification for Sin Nombre virus.