How long can the swine flu virus be viable on objects such as books, remote controls and door knobs?

Influenza viruses can survive on surfaces for varying periods depending on the surface type and environmental conditions. On hard, non-porous surfaces like doorknobs and remote controls, the virus typically remains viable for 2-8 hours, though some studies show it can persist up to 24 hours. On porous surfaces like books or paper, survival time is generally shorter.