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Cold viruses are constantly mutating into different forms which is one of the reasons that there is no vaccine to prevent the common cold yet (the virus mutates before a vaccine can be developed in time to prevent that strain and a new strain takes its place.) There are currently many many cold viruses in circulation, each mutating over and over, so as soon as someone might identify the type in a specific location, it will change to different types.

Colds are usually caused by the rhinovirus (up to 40% of colds), or Coronaviruses (about 20%), but there are more than 200 viruses that can cause the common cold that each can rapidly mutate into new forms, which circumvents our ability to gain immunity.

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13y ago

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