(NEW YORK) -- Don't be surprised if some of your co-workers call out sick on Tuesday from a mystery illness. As USA Today points out, it's an annual bug you might call the Call of Duty virus.
Call of Duty: Black Ops II went on sale at midnight at some stores and it's expected to be the biggest video game release of the year.
Many gamers have been playing it since it went on sale overnight and will likely be playing it all day Tuesday.
Call of Duty releases make more than big budget feature films -- the last one made over $400 million on the first day. By comparison, Halo 4, which Microsoft released last week, raked in $220 million on launch day.
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