VOLKER STEGER / SCIENCE PHOTO LIBRARY VOLKER STEGER / SCIENCE PHOTO LIBRARY
Hepatitis B vaccine. Bottle containing 'Shanvac- B', a recombinant DNA vaccine against hepatitis B. Traditional hepatitis vaccine contains the full virus, which could potentially become active and infect patients. A recombinant vaccine is made by inserting a piece of DNA from the virus into another organism, such as a bacterium. The viral protein is expressed by the genetically modified (GM) bacterium and purified for use as a vaccine. Because the vaccine only contains a viral protein, and not the whole virus, there is no risk of the virus becoming active. Shanvac-B is manufactured by Shantha Biotechnics, a biotechnology company in Hyderabad, India.
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