Should you stay home if you have a cold? Companies ask him all the time, Prof. Eccles says. 'If you're not feverish, I say, 'Go to work. Carry on. You can even go swimming or running. The important thing is to listen to your body. Don't push yourself beyond the normal limits.'' Even though colds can spread on hands and surfaces, they are less contagious than people think, says Prof. Eccles. 'Unless you're around children -- children are little bags of viruses.'

　　Pediatricians and teachers who work with small children often get sick constantly early in their careers, and then rarely after that. It's partly from developing antibodies, and partly from developing caution, says Melissa Sedlis, a Manhattan pediatrician. 'You get a sixth sense for when you've been exposed and you need to wash your hands again,' she says.

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