 Between 1918 and 1921 d'Herelle discovered different types of bacteriophages that could infect several other species of bacteria including "Vibrio cholerae".Bacteriophages were heralded as a potential treatment for diseases such as typhoid and cholera, but their promise was forgotten with the development of penicillin.Since the early 1970s, bacteria have continued to develop resistance to antibiotics such as penicillin, and this has led to a renewed interest in the use of bacteriophages to treat serious infections.