Règle correspondante
Practice Relating to Rule 88. Non-Discrimination
Section C. Wounded and sick
Mexico’s Army and Air Force Manual (2009) states: “According to the provisions of these Conventions, … the sick and the wounded must be respected and protected by the party in whose power they are and must not be discriminated against on the grounds of religion, nationality or political opinions.” 
Mexico, Manual de Derecho Internacional Humanitario para el Ejército y la Fuerza Área Mexicanos, Ministry of National Defence, June 2009, § 73.