Viral colds can be combined with or followed by bacterial infections as the illness progresses. If a viral cold progresses, the nasal mucus may become yellowish or the sputum may become yellowish, and fever may develop. Bacterial infections may also be considered if there is inflammation of the tonsils and purulent changes. If viral colds are combined with bacterial infections, it can be determined by routine blood tests, and if there is an increase in neutrophils, it is necessary to consider the combination of bacterial infections. You need to use antibiotic drugs such as amoxicillin and azithromycin under the guidance of your doctor. Viral infections combined with bacterial infections are more common in the clinic, if the disease does not recover patients need to consider this possibility. The treatment requires the use of antibiotics such as penicillin and other anti-infective treatment under the guidance of the doctor.