And lots of other UV gets though. Sunlight remains a great disinfectant, maybe not as much as a narrow-spectrum bulb, but it still carries plenty of microbe-killing power. From the actual article:
>> In a paper submitted to the Royal Society of London, they described how over the course of six months they had used sunlight to prevent bacteria from growing in a tube.
Humans have known about this for millennia, with ancient doctors regularly telling people to expose wounds to sunlight. Even animals have been seen instinctively "sunning" a wound. (I remember a BBC doc about Antarctica where a penguin was shown exposing a bite wound to the low-angle sunlight.) Only in recent years has a fear of cancer caused us to retreat from any and all sunlight, a fear revisited as we learn the downsides.