Table 1.

Presence of different CRISPR-cas system types in bacterial species

CRISPR-cas system	Bacterial species	References
Type I	E. coli, P. aeruginosa, M. xanthus, B. halodurans, C. concisus, C. curves, C. fetus, C. hominis, C. rectus, Y. pestis, Salmonella specie, E. amylovora, P. acnes	[18, 22–29]
Type II	S. thermophilus, S. mutants, N. meningitides, C. jejuni, L. pneumophila, L. monocytogenes, F. novicida, S. pyogenes, S. aureus, M. gallisepticum, E. faecalis	[21, 30–38]
Type III	P. furiosus, S. epidermidis, M. tuberculosis	[39–41]