Azithromycin for Injection can be used to treat pneumonia, which is an inflammation of the lungs caused by bacteria, viruses, mycoplasma, chlamydia, legionella, and protozoa. Bacteria also include gram-negative and gram-positive bacteria, azithromycin has antibacterial effect on common gram-positive bacteria as well as mycoplasma and chlamydia. However, in recent years, gram-positive bacteria have a high rate of resistance to azithromycin, and mycoplasma infections also have a high rate of resistance, so these factors should be taken into account when choosing azithromycin. In addition, Mycoplasma infections in pediatrics cannot use quinolones, and tetracyclines are used with caution, so the chances of choosing azithromycin for Mycoplasma infections in pediatrics are very high.