Table 1 Presence of different CRISPR-cas system types in bacterial species

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, 22,23,24,25,26,27,28,29]

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, 30,31,32,33,34,35,36,37,38]

Type III

P. furiosus, S. epidermidis, M. tuberculosis

[39,40,41]