People often wonder how they can avoid catching colds, flu and other infections, which seem to abound at any time of year. Unfortunately, we often find ourselves sitting in close proximity to someone in the train, who has a streaming cold and is sneezing the virus into the carriage. Apparently, the average sneeze produces around 40,000 infectious droplets, which are spread at a speed of around 135ft per second. Then there is the workplace, where viruses and bacteria seem to thrive and nobody can shake them off. Even the air-conditioning in planes can be a source of infection; and children often bring home infection from school. So what to do?
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