Scientists change one blood group into another - Telegraph
"Scientists have developed a simple method of converting blood from one group to another.
The breakthrough could potentially mean the end of blood shortages by boosting supplies of group O negative blood, which can be given to anyone.
Writing in the journal Nature Biotechnology, an international team of researchers described how they converted blood from group A, B or AB to group O. "
"Giving patients the wrong blood may result in a severe immune reaction and even death."
"Patient trials will have to take place before group O blood produced by the conversion method can be used in hospitals.
The National Blood Service, which serves England and North Wales, currently has around 40,000 units of blood in stock - enough to last about five and a half days."