Which one of the following disease is not caused by bacteria?

The correct answer is Option (3) → Common cold

Option (1) Dysentery — A disease caused by bacteria. Dysentery is an infection of the intestine with loose motions carrying mucus and blood. NCERT lists it among the bacterial diseases of man, along with plague and diphtheria. (Amoebic dysentery is a separate disease, caused by a protozoan.)

Option (2) Diphtheria — A disease caused by bacteria. Diphtheria is a bacterial infection of the throat and nose. Children are protected from it by the DPT vaccine.

Option (3) Common cold — Not caused by bacteria. The common cold is caused by rhinoviruses, a group of viruses. They infect the nose and the respiratory passage but not the lungs.

Option (4) Plague — A disease caused by bacteria. Plague is caused by a bacterium spread by the fleas of rats. It is another of the bacterial diseases of man.

NCERT Extract:
Common Diseases in Humans – …