We performed infection assays using cmk*, C_cmk* (a complementary strain), and Δcmk (cmk null mutant) simultaneously and found that cmk* and Δcmk were resistant to a high phage titer (3.15 × 107 PFU) (Figure 4A), with EOP values of 5.8 × 10−5 and 4.5 × 10−5, respectively (Figure 4B). This evidence concerns the gene CMPK1 and infection.