I don't think you should be working either!!!!!
Working with a cold is a really tricky subject, and I still don't know the answer.
My thinking is that my job (white collar) whilst not physical, needs quite a lot of energy from thinking etc. So, to be at home, not working, and using that energy to fight the bug is the best thing. You can also nap throughout the day to keep those batteries charged up. I'd also not be travelling (even by car), and not spreading it to colleagues.
Instead, I often opt for "working from home". This gives many of the benefits of the above solution, but also allows you to be productive whilst resolving you of the guilt sometimes associated with taking time off as sick.
However, even with option 2, I have found that some peers/warriors tend to think it is best to come into the office and make it known exactly how ill you are, and to look down on those who don't take this approach.