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What describes a contagious disease?

  1. Transmitted from one person to another

  2. Caused by bacteria only

  3. Preventable through vaccination

  4. Only affects the skin

The correct answer is: Transmitted from one person to another

A contagious disease is characterized by its ability to be transmitted from one person to another, typically through direct or indirect contact. This definition captures the essence of how infectious diseases spread within communities and populations. It highlights the importance of understanding transmission routes in terms of controlling and preventing outbreaks. While some contagious diseases are caused by bacteria, others are caused by viruses, fungi, or parasites, so that description is too narrow. Additionally, not all contagious diseases are preventable through vaccination, as this only applies to a subset of them. Lastly, contagious diseases can affect various systems in the body, including respiratory, gastrointestinal, and more, rather than being confined exclusively to the skin. Thus, defining a contagious disease primarily involves the aspect of person-to-person transmission.