Passage: The medium is filtered through porcelain filter, holding back bacteria and larger objects; only the smaller phages pass through.In early 1919, d'Hérelle isolated phages from chicken feces, successfully treating a plague of chicken typhus with them. After this successful experiment on chicken, he felt ready for the first trial on humans. The first patient was healed of dysentery using phage therapy in August 1919. Many more followed.

Question: Who held trials on humans?
d'Hérelle