Manuka honey has been the subject of numerous scientific studies at the University of Waikato in New Zealand, Cardiff in the UK and many other centres of study around the world. It is still being studied by scientists in New Zealand and around the world on an ongoing and continuous basis. Many in the medical and scientific community believe that we have only scratched the surface of Manuka honey use and capability. The processes involved are long and complex. Many within the scientific community believe that major advances in our understanding of Manuka honey will be achieved over the next decade.
Here are a few references (links) to some of the scientific studies that have been done to date.
For more information on scientific research being done in New Zealand, go to the Waikato University Research Commons and do a search for Manuka Honey.