phage preparation by genetic engineering is a time-consuming job and from realistic point of view it clashes with the rapidity of an appropriate antibacterial therapy (the patient could be in a danger situation and the action time could be short).
If in a country the constitution and the updating of a Bank for circulating natural lytic phages used in phage therapy is hard and expensive, the constitution and the updating of a Bank for genetic engineering phages used in phage therapy is very hard and very expensive.
The use of natural lytic phages may reduce these aspects.
