In fact all invasors shall be identified by the body defenders as dangerous invaders, except those ones that are part of the body's normal living microorganisms like the gut flora for instance. They are lactobacillus found in yougurts.
If they are more aggresive, a lot of defenders are sent to the battle field to fight them.
There are no "friendly" invaders when the subject are microorganisms, except those ones mentioned above.
immune system
The immune system must attack the bodys own cells
its killer T cells
axons neurons , cells help protect the bodys defense system against infection ..auto-immune defiency ...also oxygen
yes it can because it is a bacteria, the bodys immune system automatically starts producing more white cells to fight off the bacteria
Cardiovascular
"Immunological system" is just a fancy way to say "immune system".
Circulatory system
yes
I believe the bodies transportion system is the cardiovascular system :)
the nervous system.
Parts of your body try to fight it off, but if it doesn't you get sick