| PATENT ASSIGNEE'S COUNTRY | USA |
| UPDATE | 12.99 |
| PATENT ASSIGNEE | American Cyanamid |
| PATENT CLAIMS |
An isolated & purified mutant strain of "Serpulina hyodysen teriae" (I) capable of eliciting an immune response against a wild-type virulent strain of (I) & that is less virulent than the wild-type strain, said mutant strain being generated by using a genetic engg technique that abolishes the expression of hemolysin encoded by the chromosomal TLY gene |
| PATENT PHOTOCOPY | Available on request |
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