1. communicable disease
It is an illness caused by an infectious agent, such as bacteria, virus, fungi or parasites
and/or toxin. Most of these diseases can be passed from one person to another.
The pathogenesis of a disease is the mechanism that causes the disease. The term can
also describe the origin and development of the disease, and whether it is acute,
chronic, or recurrent. The word comes from the Greek pathos ("disease") and genesis
("creation").
A non-communicable disease, or NCD, is a medical condition or disease, which by
definition is non-infectious and non-transmissible among people. NCDs may be chronic
diseases of long duration and slow progression, or they may result in more rapid death
such as some types of sudden stroke