No that is not a typo. Certain serial number runs of the Canon T4i can cause an allergic reaction in some people. And if it does not cause you to be ill, it will at least cause you to feel bad about buying the camera only to see the rubber grips turn white.
So how do you know if you camera is affected? Just look at the serial number. If the 6th digit is a "1", then you have one of those affected models.
register your camera here.