I don't know... I suppose I should boil my water and steep my tea in the frig, but there will always be advocates of more extreme measures of safety than your own sense of extreme precaution, and I'd rather not live with the paranoia of bacteria in my tap water and cupboard tableware.
I'm not a hot tea connoisseur, but I know that different loose teas have different recommended brewing temps, some are steeped in boiling water while others are optimally steeped at body temp, etc. Safety is one consideration determining temperature; so is taste.
Yesterday, I saw a gallon of tea pasted with Arnold Palmer's face on the shelves at my local CVS store and realized what it was thanks to this DC thread.
The wiki for roasted barley tea: Roasted barley tea - Wikipedia, the free encyclopedia