Scarlet fever
Leonora Armstrong was an American pioneer living in Brazil when she saw to a translation into Spanish. She decided to go to Madrid to study the Spanish language because Shoghi Effendi, then head of the religion, wanted Spanish literature and she wanted to become proficient in the language. In July 1930 she boarded a French ship which first took her to several ports of call in West Africa and then to Barcelona. From Barcelona she proceeded to Madrid where she intended to take university courses. However she soon fell seriously ill with Scarlet fever for a time and was unable to take courses at a university of Madrid. When she recovered she went on Baháʼí pilgrimage and afterwards focused her efforts in Latin and South America.