Colds have a certain degree of contagiousness, but the contagiousness of influenza is stronger than the common cold, and viral colds are more contagious than bacterial colds, so colds have a certain degree of contagiousness, but different pathogenic microorganisms caused by the cold contagiousness is not the same, the details are as follows: 1, viral infection caused by the cold: generally can be given antiviral treatment or Chinese herbal medicine The following is a list of the most common types of cold and flu: 1) cold and flu: you can use Ma Huang Tang plus or minus, cold and flu clearing granules, cold and flu capsule to disperse the wind and cold and relieve the symptoms. 2) cold and flu: you can use Yin Qiao San plus or minus, or Jin Hua Qing Qi, Lian Hua Qing Fei, to disperse the wind and heat and relieve the symptoms. 2) cold and flu caused by bacterial infection: you can be given Amoxicillin and amoxicillin clavulanate potassium of penicillin, cephalosporin cefadroxil and cefuroxime of cephalosporin class, and azithromycin of macrolide class. For adults older than 18 years old, antibiotics of the quinolone class, such as levofloxacin mesylate, are also used for anti-infection treatment.