A newly published PLOS ONE study assessed the long-term efficacy of the therapy and demonstrated that a single gene therapy treatment led to prolonged production of VNA in blood and protected the mice from subsequent exposures to C. botulinum toxin for up to several months. Virtually all mice pretreated with VNA gene therapy survived when exposed to a normally lethal dose of botulinum toxin administered up to nine weeks later. Approximately 40 percent survived when exposed to this toxin as late as 13 or 17 weeks post-treatment. With gene therapy the VNA genetic material is delivered to animals by a vector that induces the animals to produce their own antitoxin VNA proteins over a prolonged period of time, thus preventing illness from toxin exposures.
The second part of the study showed that mice were rapidly protected from C. botulinum toxin exposure by the same VNA gene therapy, surviving even when treated 90 minutes after the toxin exposure.
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