A disease that spreads from one person to another is called a contagious or communicable disease.

Here's the breakdown:

* Contagious emphasizes the ease of transmission, meaning it can easily spread from person to person.

* Communicable implies the disease is transmitted through various means, like direct contact, airborne particles, or contaminated objects.

Both terms are often used interchangeably to describe diseases that can pass from one person to another.