There is Bacteria everywhere. It can spread by touching objects or coming into contact with someone who is sick.
This man is contagious he has a bacterial infection. The bacteria has gotten past his line of defense. The skin, mucus, and nose hairs are examples of the first line of defense. These are also non-specific defenses
Ughh, my throat hurts.
The bacteria is starting to cause inflammation.
We the phagocytes come in and chew up the invading organism.
We the t-cells come in next we kill the virus. Then my buddy b-cells over there will help.
I'm a b-cell and I will create antibodies which is a specific defense. We will help the body know what the virus is to fight it the next time it comes.