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DOR BioPharma Announces Publication Describing Results of Its,Multivalent Botulinum Toxin Vaccine BT-VACC

MIAMI--(MARKET WIRE) -- July 02, 2007 -- DOR BioPharma, Inc. (OTCBB: DORB) ("DOR" or the "Company") announced today that the first results from testing of a multivalent form of its botulinum toxin vaccine, BT-VACC™, have been published in the journal Infection and Immunity (Ravichandran et al., 2007, Infection and Immunity, v. 75, p. 3043 ). These results are the first that describe the protective immunity elicited by a multivalent vaccine that is active by the mucosal route. The vaccine consists of a combination of three non-toxic subunits of botulinum toxin that induced protection against the corresponding versions of the natural toxins.

The results published in Infection and Immunity show that non-toxic subunits (protein components of the natural toxin) of three of the serotypes of botulinum toxin that cause almost all instances of human disease, namely serotypes A, B, and E, can be combined and delivered via nasal administration. The combination vaccine induced antibodies in the serum of mice and protected against subsequent exposure to high doses of a combination of the natural A, B, and E serotype neurotoxins. Further, the combination vaccine can induce protection when given mucosally as a booster to animals that have been given a primary vaccine injection.

BT-VACC™ is composed of a component of what is known as the heavy chain of each of the A, B, and E serotypes. These components lack the region of the toxin that are responsible for blocking neurotransmitter functions. The subunits can bind avidly to receptors on the surface of mucosal cells and traverse lung and gastrointestinal tissue to stimulate immunity. Because the binding subunits lack the toxic part of the molecule, the vaccine is safe and stimulates antibodies in not only the blood but those antibodies that coat mucosal surfaces. It is thought that antibodies that are present in lung and gastrointestinal secretions wil
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