Why aren’t humans immune to the common cold?

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In an episode of Star Trek, Data keeps sneezing. Wesley Crusher asks him if he has a cold; “something people use to get", if only it were true. For millennia, humans have been plagued by the common cold. Colds are caused by a virus. Why don't humans develop immunity, like with the small pox virus? It would seem that after all of this time and with the vast number of people affected; the immune system would recognize the cold virus? Also, how does weather affect the cold virus?
10 minutes ago
 
1. Cold weather:-
In the United States, most colds occur during the fall and winter. Beginning in late August or early September, the incidence of colds increases slowly for a few weeks and remains high until March or April, when it declines. The seasonal variation may relate to the opening of schools and to cold weather, which prompt people to spend more time indoors and increase the chances that viruses will spread from person to person.
Seasonal changes in relative humidity also may affect the prevalence of colds. The most common cold-causing viruses survive better when humidity is low—the colder months of the year. Cold weather also may make the nasal passages' lining drier and more vulnerable to viral infection.

2.More than 200 different viruses are known to cause the symptoms of the common cold and they mutate frequently - hence the immunity problem.
 
Not "A" virus, but a whole family of them that constantly mutate so it's impossible to be immune to them all. The cold dry air dries out the mucous membranes and allow the virus to get into the body.
 
I just know that the cold weakens your white blood cells (which are used to fight bacteria) which is why people get the common cold in the cold more often than the warmer seasons.

Good luck finding your answer!
 
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