Why isn’t our immune systems completely immune to things like the common cold?

Question

I mean common cold has been around for a long time. How has the immune system not learned how to fight it?

In: Biology

Answer 1

There is no one cold virus. There are about 200 viruses that cause cold like symptoms. Most are rhinoviruses (about 10% are corona viruses). You likely have immunity to many, just not all. That’s why kids get so many more colds than adults.