Question

What are first-level causes of the disease?

Answer 1

First-level cause:

1. An organism that enters our body and causes the disease is referred to as a first-level cause.
2. It is also referred to as the disease's immediate or primary cause.
3. For example, viruses, bacteria, protozoa, and so on.
4. Pathogens are the disease's first level cause of infectious diseases.