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Mark is contagious with an infectious disease that can be passed through the air or from mucas sprayed on Bella.
Bella's immune system fights this air-borne pathogen. Her skin is the first line of defence to keep pathogens from entering her body.
Gross! I hope I don't get sick..
The pathogens have entered Bella's body and phagocytic white blood cells are working hard to travel throughout her body to engulf and destroy the foreign bodies using phagocytosis.
Bella's third line of defence are lymphocyte's, a different kind of white blood cell, that find the pathogen and release proteins to isolate and destroy it.
Bella's immune system defeats the pathogen and Bella is back at Basketball. Her body has built up a memory and immunity to respond quickly so she doesn't get sick again.
Bella's mom takes her to Dr. Wolfhard to get immunized against other pathogens.
This won't hurt a bit!
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