http://scienceblogs.com/erv/2010/04/our_vaccines_are_clean.php"I dunno if you guys know how good we have it today with vaccines.
Let me try this analogy-- Lets say you want to bake some bread. You have a basic recipe, so you know you need flour, yeast, water, and you make some really basic bread. Except the bread that comes out of the oven is a loaf of cinnamon raisin walnut bread. So, youre happy, cause you got bread, and its good, but you dont know how the hell the cinnamon/raisins/walnuts got in there.
Thats kinda how old-school vaccines worked. Scientist made a vaccine, it worked, yay!... but there was other stuff in that end batch they didnt know was there cause they didnt know they added it and they didnt know to look for it, or they plain ol didnt know such things existed.
Does that make any sense? Just a long way of saying "In the olden days, vaccines could get a bit messy."
With the technology we have at our disposal today, this isnt really an issue anymore. Not only do we have lots of lovely ways of killing wayward things that might sneak into a vaccine, but we have lots of neat technology for monitoring our vaccines for little buggars that still try to sneak through.
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Good news. Good stuff, IMO.
:hi: