An antigen test for the common cold will not be positive if it is an antigen test for the new coronavirus, but will be positive if it is an antigen test for other viruses in the common cold category. Common colds are usually caused by viral infections such as rhinovirus, respiratory syncytial virus, adenovirus, coxsackievirus, parainfluenza virus, etc., and may also be caused by bacterial infections such as Streptococcus haemolyticus, Haemophilus influenzae, and Streptococcus pneumoniae. Colds caused by the above microorganisms will not be positive if antigenic testing for the new coronavirus is performed. Each virus and bacterium has its own specific antigens, and antigen testing is used to determine which microorganism is responsible for the infection. Generally, for viruses, nucleic acid testing and antigen testing can be used; for bacteria, bacterial culture can be used. Patients with a common cold who are targeted for antigen testing for viruses such as rhinovirus and respiratory syncytial virus will show a positive test for the corresponding antigen and a negative test for the other antigens.