Typically clinical diagnosis after excluding other possible treatable infection
Antigen detection, PCR assay, virus isolation, and serology can be used to identify<unk>  infections, but the presence of virus does not necessarily mean it is associated with disease
Adenovirus
Viral respiratory illness also caused by:
Rhinovirus
Rhinoviruses
Arbovirus
Coronaviruses
Coxsackie virus
Influenza viruses