Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Tafiya: A cikin 1920, d'Hérelle ya yi tafiya zuwa Indochina, yana ci gaba da nazarin cutar kwalara da annoba, daga inda ya dawo a ƙarshen shekara. 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 ji tausayin d'Herelle kuma ya ba shi kujera (a zahiri) a cikin dakin gwaje-gwajensa. A cikin 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 shekara ta gaba, likitoci da masana kimiyya a yammacin Turai sun ƙara nuna sha'awar maganin ƙwayoyin cuta, kuma sun yi nasara wajen gwada shi a kan cututtuka dabam dabam. Tunda kwayoyin cuta sun zama masu tsayayya da kwayar cuta guda daya, d'Herelle ya ba da shawarar yin amfani da "kwayar cuta" mai dauke da nau'ikan kwayar cuta daban-daban.  Tambaya: Yaushe d'Herelle ya tafi Indochina?
Shekarar 1920