Sars-related business promotions are spreading faster than the disease. Some deal with panic, some try to make you spend, but our favourite is Fluid Designs' Survive Sars game. Its purpose is to 'make people smile'.

Players fight Sars by moving a 'fluid' bottle and spraying droplets falling out of the nose of a virus super-spreader. But be careful: 'Each time you get hit by a droplet your trusty mask takes some damage. Three hits and you're out.'