Why it is required to have plasmid to have polymorphic immunity in a bacterial population?

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Jai Ghosh

Normally it is the palindromic repeats which gives the polymorphic immunity, but of course its distribution with the spacers is equally important too.

Samy Selim

see this article, I hope helpfull:

Article Dynamics of adaptive immunity against phage in bacterial populations

Maan M Neamah

See these articles, it would help hopefully:

https://www.frontiersin.org/articles/10.3389/fmicb.2016.01292/full

http://johnsonlab.med.harvard.edu/Micro201/Nat%20Rev%20Microbiol%202010%20Labrie.pdf