Yes, we call different viruses that cause the same symptoms a cold. Unless we test the person, we do not know what virus they carry so it’s not really necessary to come up with different names.
Some colds could be caused by bacteria. Generally, if you have a higher temperature, then it may be a bacterial infection.
Also if you have had the virus or bacteria before then, generally, you will not catch it again. So each time you get a cold it’s probably a different virus. Cold viruses can mutate but it’s not as fast as the flu
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