The meshes of the basic preventive net will inevitably be too large for some people. Such individuals should be provided with individualized prevention which can be defined as preventive measures adapted to the level of disease and manner of living (readiness) of the individual. Individualized prevention is instituted when basic preventive measures have not given the desired result, i.e., for risk cases characterized by a disease activity which is much higher than for the group as a whole. This judgement is, of course, relative because it also takes into account resources and resource distribution.