Quite apart from the super bug issue 
http://news.bbc.co.uk/1/hi/health/6202679.stm 
where antibiotic use has lead to the creation of difficult to eradicate
bacteria there is another problem. One of direct human toxicity.

BOVATEC and AVATEC are animal antibiotics (coccidiostats), active
constituant LASALOCID SODIUM and they are recognized HEART POISONS. Don't
ever think you will be prescribed this substance by your doctor. It is one
of a group of antibiotics (IONOPHORES) given to animals and fowl in feed,
all of them highly cardio-toxic to humans. These antibiotics when fed to
animals and fowl leave residues in meat, milk and eggs. The concentration
of these residues is often dangerously high. See
http://www.freewebs.com/lasalocid

Though the report is several years old and there have been assurances that
this is no longer a problem a very recent experiment has shown that this
is not the case. It has been shown by the author of the report that
certain dairy products still present a real danger. Interestingly the
products sampled were Organic and Soil Association stamped.

It is time these antibiotics were withdrawn.

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