What is infection?
The infection when occurs microorganism pathogen enters and proliferates within an organism. This abnormal situation is called infectious disease.
If an infectious disease can be easily transmitted to another individual, it is called a contagious disease, but not all infectious diseases are contagious.
Living beings have defense mechanisms to protect themselves from the entry of pathogenic organisms. They are grouped into two types:
- Nonspecific mechanisms: they do not depend on the nature of the microorganism it is trying to infect.
- Specific mechanisms: they depend on the type of infecting agent.