Just a few years ago Ijad Madisch of Germany was doing medical research at Harvard, armed with a PhD in virology.

FORBES: How Ijad Madisch Aims To Disrupt Science Research With A Social Network

However, Dr Jonathon Stoye, head of virology at the UK's National Institute for Medical Research, suggested the results should be interpreted cautiously.

BBC: NEWS | Health | Pig organs may be safe for humans