Sorry, you’re mistaken. The ‘flu is not a cold. Flu is caused by the flu virus (commonly Influenza A) and can have more serious consequences than the common cold (usually a Rhinovirus). Yes, both viral infections, but caused by very different viruses. People often say “just a virus” when referring to the common cold, but forget that many viruses can be much more serious - e.g. influenza virus, coronavirus, herpes virus, hepatitis virus, Ebola virus.... Sorry to be pedantic about terminology, but flu is NOT “just a cold”