Bacteriophages are, in eastern countries including Russia, a pretty common, or at least well known, approach to get rid of bacterial infections.
(This is discussed in How Dangerous Are Superbugs Really? | Virus Vs Bacteria | Spark).
Why are phages much less commonly used in the western world?
Intuitively, using a virus that only attacks a specific species of bacteria sounds like a really good form of, or alternative to, antibiotics.
