ESCHERICHIA COLI NEUROTOXIN HAVING AN AVERAGE MOLECULAR WEIGHT OF 100,000 DALTONS OBTAINED FROM THE SURNANT OF CELLS BROUGHT FROM A CULTIVATION OF ESCHERICHIA COLI OF A SEROTYPE CAPABLE OF CAUSING PEDEMAL OEDEMUS DISEASE /P. P THE INVENTION IS ALSO A SUBJECT FOR A VACCINE AGAINST SWALLOWED SWELL DISEASE CONTAINING THIS TOXIN.
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