What are communicable diseases best described as?

Communicable diseases are best described as diseases passed from person to person. This definition highlights their mode of transmission, which typically involves pathogens such as bacteria, viruses, parasites, or fungi. These diseases can spread through various means, such as respiratory droplets, direct contact, or contaminated surfaces, making them highly relevant in discussions of public health and infection control.

Understanding this characteristic of communicable diseases is crucial, as it influences prevention strategies like vaccination, hygiene practices, and public health policies aimed at minimizing outbreaks. The other options present categories of diseases that are not primarily transmitted between individuals. Genetic diseases originate from inherited features rather than transmission, lifestyle-related diseases arise from personal choices affecting health, and environmental diseases are influenced by external factors like pollution but do not involve direct person-to-person spread.