Issued in 1962, this 40 centavos Mexican stamp promotes the global campaign against malaria (“El Mundo Unido Contra el Paludismo”). The striking design combines scientific imagery—a microscope and laboratory bowl—set against a world map, overlaid with a large red mosquito, the insect responsible for transmitting malaria. This stamp reflects international cooperation in public health, echoing the World Health Organization’s eradication efforts of the mid-20th century. A symbolic issue highlighting science, medicine, and humanitarian unity.