When was the bacteriophage phenomenon rediscovered by D'Herelle?

Explanation

Félix d'Hérelle, a French-Canadian microbiologist, is credited with the discovery of bacteriophages and the recognition of the phenomenon known as phage therapy. He first observed the lytic activity against bacteria in 1917, during his work at the Pasteur Institute in Paris. D'Hérelle's groundbreaking discovery of bacteriophages and their ability to infect and kill bacteria laid the foundation for the field of virology.