It's a common misconception that colds are simply a result of exposure to cold weather or that they don't actually exist. In reality, colds are caused by a variety of viruses, with rhinoviruses being the most common culprit. There are over 200 different viruses that can lead to cold symptoms, and they mutate and evolve over time.
Here are some reasons why we seem to get colds every year:
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Multiple Viruses: Since there are so many different viruses that can cause cold-like symptoms, getting infected by one type one year does not provide immunity against other types. This means that even if you develop antibodies to one virus, you can still catch another.
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Mutation: Viruses, including those that cause colds, mutate frequently. This allows them to evade the immune system, making it possible to contract the same virus again if it has changed enough.
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Immune Response: Our immune system does develop a response to viral infections, but this immunity can wane over time, especially if the virus alters its structure through mutation.
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Seasonality: Colds are more common during the fall and winter months when people tend to be indoors more and in closer contact with one another, facilitating the spread of viruses.
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Cumulative Exposure: Over time, as people are exposed to various viruses, they may experience colds more frequently, particularly if they are in environments (like schools or crowded workplaces) where viruses can spread easily.
In summary, colds are indeed real and are caused by various viruses that mutate and spread within populations, leading to the frequent occurrences we experience each year.