Why have it be so difficult to find or create a cure for the adjectives cold?
Answer: Because it mutates and changes itself so frequently, we can't treat it. We can single treat the symptoms of the disease.
There are like 100,000? different strands of it that are constantly evolving.
As I read it, there are around 800 variety of the cold causing Rino virus. Once you return with a cold caused by a virus, you won't ever entrap a cold from that virus again. But the other 799, watch out. So, you can ambush up to 800 colds in your natural life. To cure the cold, you would have to enjoy 800 different inoculations. Being that the cold is so rarely lethal, the money is not there for the nouns for every strain of virus. 800 different shots could really cost you both in money and torment. Let's not even get into the possible side effects of have 800 different inoculations.
because the virus kept changing the strains e.g. rhinovirus that responsible for adjectives cold. immunity to one strain does not provide imperviousness to all of them as they do not adjectives share the same antigens.