| abstract |
Interferons from bovine, porcine, equine and ovine in high purity effective across species lines. The interferons are obtained by challenging viable leukocytes in vitro with an interferon inducer, preferably an inducer infectious to the host animal, then recovering the interferon from the culture medium. After purification to in excess of 106 International Reference Units per mg of protein the high purity animal interferons are non-antigenic in the human. |