According to the UK's CJD Surveillance unit in Edinburgh University, CJD (Creutzfeldt-Jakob disease) is an illness which exists in different forms.  These forms are essentially distinguished by the cause of the illness in each case. However, in addition, the symptoms and course of the illness tend to be relatively different in the different forms. Also, the neuropathological features (what one sees under the microscope) tend to be different in the different forms.

The four forms of disease are as follows (please click on each to find out more):