In his particular case the symptoms were entirely above the neck, mostly congestion and sore throat. That being the case we continued our scheduled workouts but reduced the intensity a bit to ensure we remained completely aerobic.
Had the symptoms been below the neck (body aches, fervor, etc...) it would have called for a different protocol, namely take a few days off. Generally, if you take a break and rest you'll get over the entire illness faster than if you try to suffer though it. If you try to push too hard when sick with a cold or flu you could easily end up with further complications.
Have respect and listen to your body when it is trying fighting illness.