Epidemiologists divide the disease load into three major types of disability or disease, as indicated in the figure below: Noncommunicable diseases (NCDs), communicable illnesses, maternal, neonatal, and nutritional disorders, as well as injuries
Infectious diseases are diseases or disorders caused by some organisms. Organisms such as bacteria, viruses, fungi, or parasites when invade the body one suffers from such diseases. Some diseases transfer from person to person by direct contact; some with the help of vectors (could be insects or animals) and some even with the help of vehicles such as food, water, etc.
There are many such diseases like measles, and chickenpox, that can be prevented by vaccinations.
Some important communicable diseases are discussed below:
There are many other infectious diseases but these are the main diseases that affect the whole world.