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RNA editing, CRISPR-Cas 13 provides herd immunity against dsDNA phage.

CRISPR-cas13: the only RNA editing CRISPR till date.

CRISPR
RNA targeting CRISPR-cas13 provides immunity against dsDNA phage without cutting the genome, unlike the other 5 types which work by cutting the genome. CRISPR-Cas13 works differently.  It provides herd immunity to the bacteria.
CRISPR-Cas13
There are six types of CRISPR in literature till now (1-6).
CRISPR Cas VI is the only one that cuts the RNA. It cuts the RNA transcript complementary to the target sequence of the mRNA. After cutting the complementary RNA, it starts cutting all other mRNAs of the phage which Scientists called Collateral damage. This is the phenomena that provide Herd immunity.

3D structure of CRIPSR-Cas

References: Cas13 Helps Bacteria Play Dead when the Enemy Strikes. Cell Host and Microbe.
https://doi.org/10.1016/j.chom.2019.06.012

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