From the official site:

George Michael Health Update

Professors Gottfried Locker & Christoph Zielinski would like to make a statement regarding George Michael.

Further to our previous statement Mr. Michael is being treated here for pneumonia and nothing else.

The latest development in Mr. Michael’s case – which has evolved from a severe pneumococcal infection – necessitated intensive care due to its severity and extension. We are happy to announce that Mr. Michael is improving steadily with an impressive regression of pneumonic symptoms and follows a steady rate of improvement as hoped.

There are no other health issues with regards to the patient other than the underlying pneumonic disorder, and no further measures had to be taken.

Mr. Michael is receiving precisely the same treatment as any ordinary patient in Austria would receive at the hospital for this disease.

As we said previously, complete rest and peace and quiet are mandatory.

We wish to make it clear that we are putting this statement out and there will be no further comment.