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Common cold differs from pneumonia in that:

1. Pneumonia is a communicable disease whereas the common cold is a nutritional deficiency disease.
2. Pneumonia can be prevented by a live attenuated bacterial vaccine whereas the common cold has no effective vaccine.
3. Pneumonia is caused by a virus while the common cold is caused by the bacterium Haemophilus influenzae.
4. Pneumonia pathogen infects alveoli whereas the common cold affects nose and respiratory passage but not the lungs.

Correct answer: Pneumonia pathogen infects alveoli whereas the common cold affects nose and respiratory passage but not the lungs.

Solution

Pneumonia involves infection of the alveoli in the lungs, which impairs gas exchange. The common cold mainly affects the nose and upper respiratory passages, not the lung alveoli.

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