Question 1

Why does a cold make you feel sick if the virus itself is harmless?

Accepted Answer

Most cold symptoms are caused by your immune response, not the virus. Cells release cytokines that trigger inflammation, swelling, and mucus production. The congestion, sore throat, and fever are your body's weapons against the infection, not damage done by the virus.

Question 2

Can cold weather actually give you a cold?

Accepted Answer

Cold weather does not directly cause colds, but a 2015 Yale study found that cooler temperatures in the nose weaken local immune defenses, making it easier for viruses to take hold. Winter also drives people indoors, where viruses spread more easily.

Question 3

Why is there no cure or vaccine for the common cold?

Accepted Answer

More than two hundred viruses cause colds, and rhinoviruses alone have over one hundred sixty types. Immunity built against one strain rarely protects against others, so there is no single target for a universal vaccine. Colds resolve on their own in seven to ten days.

virology

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