Among the groups that were healed of the infection after antibiotic therapy (n = 17), we observed a higher expression of IGHG1, IGHG2, and IGHG3 in the active phase of infection at 0 week, and the gene expression of these immunoglobulins was downregulated at 8 weeks of follow-up (p = 5.38 × 10−7, 7.26 × 10−6, and 4.35 × 10−5 with corresponding FDR values of 0.002183, 0.013948, and 0.042061, respectively). This evidence concerns the gene IGHG2 and infection.