Causes of Colds
Most viruses that cause colds are very contagious and are transmitted from person to person.
- Of the viruses that cause a cold, the most commonly occurring subtype is a group that lives in the nasal passages known as the "rhinovirus." Other less common cold viruses include coronavirus, adenovirus, and respiratory syncytial virus (RSV).
- Cold viruses may spread through the air and can be transmitted from airborne
droplets expelled when someone with a cold coughs or sneezes.
- The primary means of spreading a cold is through hand-to-face or -mouth
contact or from objects that have been touched by someone with a cold, or by
touching items where droplets produced by coughs or sneezes have recently landed
and then touching the face or mouth.
- The typical transmission occurs when a cold sufferer rubs his or her nose
and then, shortly thereafter, touches or shakes hands with someone who, in turn,
touches his or her own nose, mouth, or eyes.
- Virus transmission also often occurs via frequently shared or touched
objects such as doorknobs and other hard surfaces, handrails, grocery carts,
telephones, and computer keyboards.
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