I think that some of you are missing the point:
eg morloth
"Depends on how old the baby is that the bottle is being made up for. After 6 months I can't imagine that it matters. DS was licking the dog, eating whatever he could find on the ground and generally being feral by that point."
eg fernie3
From some of the foul things I have pulled out of her mouth the last few months I think this is probably one of the things least likley to make her ill!.
Yes of course the risks of a baby becoming ill are much higher the younger they are - this is due to the underdeveloped immune system.
It is also recognised now that in order to support the healthy functioning of the immune system it is generally better to be using soap and water for most cleaning and not using too much antibacterial spray.
However the bacteria which your DCs pick up from the floor/dog etc are much lower in number and not necessarily the nasty ones which may be in the formula powder.
What you are doing with formula powder is taking an unsterile product and then turning it into a liquid at room temperature - milk - which is the perfect breeding ground for bacteria. Thus you have the risk of essentially a serious food poisioning.
sapphire87 - I totally agree - it is much easier and safer to use ready to feed when out an about. This is what I did.
I am sorry but I really don't understand why people are not managing to engage with this issue.
Presumably you wouldn't give your young DCs uncooked egg or non-pastuerised cheese/milk due to the risk of food poisioning?!
Why on earth are you not prepared to make up formula using water of at least 70 deg C in order to (hopefully) kill of potentially deadly bacteria?
There are alternatives in order of decreasing risk but
ADDING FORMULA TO WATER WHICH IS LESS THAN 70 DEG C SHOULD NOT BE DONE.