Infectious diseases are diseases transmitted directly or indirectly from humans or animals to humans, caused by infectious agents. Infectious agents can be viruses, bacteria, parasites and fungi. However, not all infectious diseases have the same severity. Classification of infectious diseases depends on the characteristics of the disease.

Most infectious diseases are contagious and have a complex progression, causing the patient's body to rapidly deteriorate if not receiving timely medical assistance. Understanding the common characteristics of infectious diseases will help us be more proactive in recognizing the disease and promptly treating it.

Infectious diseases are divided into many types including group A infectious diseases, group B infectious diseases and group C infectious diseases. Of these, group C infectious diseases are considered the "mildest" but absolutely do not be subjective or take lightly the diseases in this category.

Infectious diseases are classified into several types including group A infectious diseases, group B infectious diseases and group C infectious diseases. If not detected and isolated effectively, infectious diseases can cause serious consequences for infected people or break out into large epidemics.