There are several thematic PhD programs at the Medical University of Vienna that cover topics in the field of Immunology. The main difference between the various PhD programs is whether they represent an "open" PhD program in which PhD students are recruited via application to an individual research laboratory or whether PhD students apply for a "Self Contained" PhD program at special calls.
A detailed description of the PhD programs can be found at the homepages of the PhD programs (see below).
» General information about PhD studies at the Medical University of Vienna
"Open" PhD Program:
"Self Contained" PhD Programs (Doktoratskollegs) funded by the Austrian Science Fund (FWF):