I mean common cold has been around for a long time. How has the immune system not learned how to fight it?
In: Biology
I mean it has and it hasn’t, but basically, there are very many different strains of a given virus. So for example the common cold is caused by rhinovirus. And human bodies can develop an immunity to a given strain when they first encounter and recover from it. However, since there’s millions of strains of Rhinovirus, you’re never really “immune” to the common cold. But have you ever noticed a cold going around a home or office and one or two people for whatever reason seem immune? Well that’s because they are, to that strain at least.
Latest Answers