They are the first barrier
We are born with this type of inmunologycal defense.
Sustancia que al introducirse en el organismo induce en este una respuesta inmunitaria, provocando la formación de anticuerpos.
These are part of the second barrier
Any external biological agent that can harm the host
These are part of the Third barrier
Pathogens that live outside the cells.
We acquired this type of inmunologycal defense along aour lives.
This are pathogens that need to live inside a cell.
