uh! I really need to get rid of this cold. It's getting on my nerves.
oh no! That postman has just sneezed on me
As the postman sneezed on Ben, Ben inhaled some of the droplets from the sneeze causing the flu to enter his body.
Yes, finally that postman has gone and hopefully taken his virus with him.
Achooooooo. Oh great! Now I have his cold too.
As Ben lay down on the sofa because he felt ill, the Pathogens were going through the first line of defence which is the mucus. However, the mucus cannot catch all of the virus.
Uuuugh. Cough, cough.
Lymphocytes will also produce antibodies. When certain white blood cells, called lymphocytes, come across a foreign antigen, they will start to produce proteins called antibodies. These lock on to the invading pathogens and mark them out for destruction by other white blood cells.
The flu will now encounter the phagocytes. The phagocytes detect things that are "foreign" to the body. They then engulf them and digest them.
Memory cells are also produced in response to a foreign antigen. These remain in the body and remember a specific antigen.
Yipppeeeeee! I'm finally getting better.
These memory cells can reproduce very fast if the same antigen enters the body again. This basically means that i'll be immune to this virus if it comes back.