What are the differences between influenza B, influenza A, and common cold with fever?

The differences between influenza B, influenza A, and the common cold with fever lie in their causative pathogens and associated symptoms. Influenza B and A are acute infectious diseases primarily caused by influenza viruses and are highly contagious. In contrast, the common cold is usually caused by infections with rhinoviruses, adenoviruses, respiratory syncytial viruses, and other viruses. Influenza A and B often present with high fever, headache, fatigue, and significant systemic symptoms. In patients with the common cold, however, such systemic symptoms are generally mild. Patients may experience low-grade fever, while high fever is relatively rare.