You really should not train if you have any kind of illness. Training whilst you arent fully healthy will not improve you. It will delay your recovery and weaken your immune system to combat future illnesses. You could undo all the hard work you have put in. By rule of thumb wait until you feel fully recovered, then take another day off before resuming training. Also don't jump straight back in where you left off, start off with a few shorter runs, then gradually increase until you are back onto your training plan.