Identify the category to which 'common cold' and 'chicken pox' belong to.

Communicable diseases, also known as infectious diseases or transmissible diseases, are illnesses caused by pathogens (such as bacteria, viruses, fungi, and parasites) that can be spread from one person to another.

Communicable diseases are microbial illnesses that can transmit from an infected person to a healthy person through air, water, food, or personal contact. Some common examples of communicable diseases are tuberculosis, the common cold, chicken pox, cholera, etc.