Runny nose, red eyes, and sore throat are some symptoms of the common cold. It is caused due to some very microscopic particles known as viruses. A virus is an infectious agent that multiples inside the living cells of an organism. Generally, viruses cause the most common respiratory problems like the flu, the cold, and bronchitis. Some very deadly diseases like hepatitis and AIDS are also caused by certain types of viruses.

Viral envelope

Envelope glycoproteins

Genetic material

Core proteins


dormant: describes something alive but inactive. hepatitis: a medical condition of the liver which causes swelling and inflammation. host: here, the body in which a virus reproduces and causes disease.


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