“Most phages infect only one species or even a few strains within a species; antibiotics aren’t so selective.” This however is an issue because it is not easy to determine what bacterial strain is present in an infection. Therefore, it would be necessary to have a mix of many phages to have an effective treatment. The phage created by the researches at MIT normally kills E. coli, however by switching in a different tail, researchers made the phage capable of killing at least 99 per cent of either Yersinia or Klebsiella bacteria.
This research I find to be very interesting. However, it still has a long way to go in my opinion. It seems to have many benefits but also some downfalls that still need to be worked out.