CRP and coinfection: When comparing Mycoplasma infection alone and co-infection with the viral and/or bacterial pathogens identified on the PCR multiplex panel, no significantly different distributions were observed regarding mean hospitalization time (7.3 ± 2.7 vs. 8.4 ± 4.1, p = 0.349), fever (39 [38.9–39.6] vs. 39.2 [37.2–39.6], p = 0.494), or biochemical parameters, including leukocyte count (8727.3 ± 2854.1 vs. 8950 ± 2557.4, p = 0.835), CRP (3.7 [1.3–8.5] vs. 4.2 [1–5.8], p = 0.536), and procalcitonin (0.13 [0.07–0.4] vs. 0.31) (only two patients had a procalcitonin level available) p = 0.791.