This is a finding of Norman R. Pace and his team at the University of Colorado, in the US. The scientists investigated bacteria in all kinds of human environment, including showers．Pace's team looked at 45 showerheads in nine American citiesThey discovered that 30 percent of them had large amounts of flying Mycobacterium.

　　But Pace said that they pose few threats to the health．Only those with a

　　immune system might need to worry．He told the New York Times that the bacteria are not as unpleasant as might be thought．He said that having a shower is no more dangerous than anything else we do in the morning．But for those who feel sick about the idea of all those microorganisms (微生物), he had some adviceLet the water run for 30 seconds before getting into the shower. Why? The number of bacteria is smaller than that when the water is just turned on. If that seems like a waste of water, he added that you could also change your showerhead every few months.

　　However, Pace had good news too. He has also been testing the air in US subways. Apart from iron particles (粒子), which are ground off the track by the wheels of trains, subway air is freshThe reason is that a train’s movement pumps fresh outdoor air into the tunnels.

　　Pace explained that he wanted to understand the natural microbial environments of public places. This kind of knowledge might help discover the microbes to be used in a bioterrorist (生物恐怖分子) attack 56. From the finding of Norman R. Pace, after taking a shower, we might cough or feel tired

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