A contagious disease is one that is

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Spread from person to person

Caused by a pathogen or its products

Caused by all bacteria

Transferred by Mosquitoes

answer is A.

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Detailed Solution

A contagious disease is one that is spread from person to person.

A contagious disease is a subset category of transmissible/communicable diseases (can transmit from person to person), usually infectious diseases, that are transmitted to other people through physical contact (hence the name-origin), casual contact with their secretions or objects touched by them, or airborne route, among other routes.

The other options are incorrect - Diseases caused by a pathogen are called infectious which may or may not be contagious diseases. Not all bacterial diseases are contagious. Diseases transferred by mosquitoes are vector-borne diseases, not spread by direct physical contact or airborne route.

Hence, option A is correct.

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