?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Walia%2C+K&rft.aulast=Walia&rft.aufirst=K&rft.issue=10&rft.volume=67&rft.date=October+1999&rft.issn=0019-9567&rft.atitle=Purification+and+characterization+of+novel+toxin+produced+by+Vibrio+cholerae+O1.&rft.title=Infection+and+immunity&rft.pages=5215-22&rft.genre=article