Related Rule
Practice Relating to Rule 26. Medical Activities
Section B. Respect for medical secrecy
Cameroon’s Instructor’s Manual (2006) states:
Protection of Non-Combatants in Combat Zones
Medical and religious personnel must fulfil their tasks under the special protection of the belligerents; amongst other things, they must provide assistance in the various combat zones and when circumstances require.
1. Medical Personnel
It is … prohibited to compel the medical personnel to give information regarding the wounded and sick whom they care for: information regarding the activity, relations, location or existence of the wounded. 
Cameroon, Droit des conflits armés et droit international humanitaire, Manuel de l’instructeur en vigueur dans les forces de défense, Ministère de la Défense, Présidence de la République, Etat-major des Armées, 2006, p. 229, § 541.