We always find another way to break in. Lets go around
Pathogens act as invaders. In this situation they are robbers.Skin acts as a barrier to prevent bacteria entering. In this anology the wall
YUM
Hurry!!! this portal of entry is now open!
DAY LATER
i dont feel too good
OUCH. He bit me
Ive got your antigen now
This fever is horrible
The macrophages (the guard dog), ingest the bacteria which stimulates interleukin 1. which then travels in blood to brain and acts on hypothalamus, creating a fever