A study once found that the hepatitis C virus (HCV) can remain infective for six weeks on ordinary household surfaces. You can see the free full text, or a summary for busy clinicians.
What happened in the seventh week? Did the virus cease to remain viable, or did the study just end suddenly?
From part B of this figure, it looks to me like the study just ended suddenly. But I'm not a biologist, so I'd like to hear your opinion.