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J Ind Microbiol Biotechnol. 2006 Mar;33(3):173-82. Epub 2005 Sep 30.

A recombinant vaccine against hydatidosis: production of the antigen in Escherichia coli.

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Institute of Technology and Engineering PN456, Massey University, Palmerston North, New Zealand.


A commercial process was developed for producing a recombinant vaccine against hydatidosis in farm animals. The vaccine antigen consisting of a surface protein of the oncospheres of the hydatid worm (Echinococcus granulosus), was produced as inclusion bodies in Escherichia coli. Fed-batch cultures of E. coli using Terrific broth in stirred bioreactors at 37 degrees C, pH 7.0, and a dissolved oxygen level of 30% of air saturation produced the highest volumetric concentrations of the final solubilized antigen. An exponential feeding strategy proved distinctly superior to feeding based on pH-stat and DO-stat methods. The plasmid coding for the antigen was induced with isopropyl-beta-D-thiogalactopyranoside (IPTG) at 4 h after initiation of the culture. The minimum IPTG concentration for full induction was 0.1 mM.

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