This is an overnight double layer nutrient agar of Pseumonas aeroginosa, I am just enquiring if this is a type of phage or not!
A lot of P. aeruginosa strains will undergo coordinated cell lysis at high population densities, that's what this looks like to me, not a phage infection.
i expect presence phages in the center of plate ( note plaques) while in the edges of plate (irregular ) is not
you must try by spotting method when detect phage in sample that is easiest.
with my best wishes
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