D'Hérelle, a hukumance har yanzu mataimakin da ba a biya shi ba, ya sami kansa ba tare da dakin gwaje-gwaje ba; d'Hérelle daga baya ya yi iƙirarin cewa wannan ya faru ne sakamakon rikici da mataimakin darektan Cibiyar Pasteur, Albert Calmette. Masanin ilimin halitta Edouard Pozerski ya yi wa d'Herelle jinƙai kuma ya ba shi kujera (a zahiri) a cikin dakin gwaje-gwajensa. A 1921, ya sami damar buga littafi mai suna, The Bacteriophage: Its Role in Immunity game da ayyukansa a matsayin littafin hukuma na Cibiyar, ta hanyar yaudarar Calmette. A cikin shekara mai zuwa, likitoci da masana kimiyya a duk faɗin Yammacin Turai sun ƙara sha'awar maganin phage, suna gwada shi cikin nasara a kan ƙwayoyin ƙwayoyin cuta daban-daban.
Shekarar 1920