Actually, these flies, or 'thrips' don't deserve to die so i shall not be hoovering them, i just wish i could encourage them to leave. They are so tiny though!!
Also, these tiny thrips seem to love my cat's food. I don't know if they spread disease like bluebottles but i just wave a teatowel at them, and off they go!
Mine was a sensible answer ;o). Basically there is nothing you can do. I have never heard that they spread disease and only cause damage to plants not to humans. You don't want to kill them so what else can be suggested!