Abstract: The idiopathy cobra in vivo separation's bacterium after the morphology observation, the raise characteristic and the biochemistry experiment, appraises for the backwoods E.coli. This backwoods E.coli performs the animal experiment, may cause the white mouse death, explained that it has certain toxicity. The commonly used 14 kinds of antibiotic slip of paper to separates the strain with clinical on to enter takes a walk the sensitive experiment, screens the sensitive medicine to use in the clinical care obtaining the good results, active control cobra large intestine bacillosis's unpopularity.

Key words: cobra; E.coli; therapy