These are intermediary convex with linear sutures, discreetly undulant. Ruth died in 1898 of undulant fever at the age of eleven. Edsel Ford developed metastatic stomach cancer and undulant fever. As a child, Santmyer had a severe case of undulant fever. A serpent glissant is gliding horizontally in an undulant posture. It is also known as undulant fever, Malta fever, and Mediterranean fever. Later, Asbury is informed that he has undulant fever, probably from drinking raw milk.