- 18 i) hygiene 53. It lies with prison health care services - as appropriate acting in conjunction with other authorities - to supervise catering arrangements (quantity, quality, preparation and distribution of food) and conditions of hygiene (cleanliness of clothing and bedding; access to running water; sanitary installations) as well as the heating, lighting and ventilation of cells. Work and outdoor exercise arrangements should also be taken into consideration. Insalubrity, overcrowding, prolonged isolation and inactivity may necessitate either medical assistance for an individual prisoner or general medical action vis-à-vis the responsible authority. ii) transmittable diseases 54. A prison health care service should ensure that information about transmittable diseases (in particular hepatitis, AIDS, tuberculosis, dermatological infections) is regularly circulated, both to prisoners and to prison staff. Where appropriate, medical control of those with whom a particular prisoner has regular contact (fellow prisoners, prison staff, frequent visitors) should be carried out. 55. As regards more particularly AIDS, appropriate counselling should be provided both before and, if necessary, after any screening test. Prison staff should be provided with ongoing training in the preventive measures to be taken and the attitudes to be adopted regarding HIV-positivity and given appropriate instructions concerning non-discrimination and confidentiality. 56. The CPT wishes to emphasise that there is no medical justification for the segregation of an HIV+ prisoner who is well. iii) suicide prevention 57. Suicide prevention is another matter falling within the purview of a prison's health care service. It should ensure that there is an adequate awareness of this subject throughout the establishment, and that appropriate procedures are in place. 58. Medical screening on arrival, and the reception process as a whole, has an important role to play in this context; performed properly, it could identify at least certain of those at risk and relieve some of the anxiety experienced by all newly-arrived prisoners.