With winter upon us, offices are seeing more people calling in sick. But there are still many more who 44 coming in, no matter how ill they are. Are they really doing any good when they drag themselves into work? It's referred to as "presenteeism," where sick workers perform well below their abilities, make more mistakes, and pass their illness on to their co-workers, 45 staying at home and getting over whatever is ailing them. A US study found that the phenomenon of coming in when you're sick 46 the economy up to $150 billion US. So why do people feel compelled to sit at their desks coughing and sniffling rather than rest at home? Many workers feel their job is 47 to miss while half feel guilty about their co-workers having to pick up the slack. Some just prefer to be at work, while others can't afford not to be.