Couldn't Catch a Cold - S2.E21

Dennis and his faithful hound Gnasher are out to make every day as much fun as possible, but their adventures often lead them into trouble. There's been an outbreak of the super infectious Beanotown Cold and Dennis seems to be the sole escapee, leaving him the centre of attention for all the teachers in the whole school - nightmare! Dennis is run ragged and decides he needs a day off - if only he could find a way to catch the cold too...