Why do we suffer from common cold repetatively in our life, but other viral diseases like influenza or small pox only once
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Answer:
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Answer:
It is the most common infectious disease in humans and is mainly caused by or rhinoviruses.
Because there are more than 200 viruses that cause the common cold, the human body can never build up resistance to all of them. This is why colds are so common and often return. According to the CDC (Centers for Disease Control and Prevention), adults get , and children may have up to 12 per year.
The common cold is contagious; it can be spread by air droplets from coughs and sneezes and by touching infected surfaces. It is contagious from 1–2 days before symptoms begin until the symptoms have stopped.
Small pox is caused by variola virus. Antibodies develop after you get infected by the viruse and become protected against the infection unlike cold.
Influenza type C infections generally cause mild illness and are not thought to cause human flu epidemics. Influenza D viruses primarily affect cattle and are not known to infect or cause illness in people.
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