- Algae --> neurotoxin.
-Fungi --> inhale spores.
--> enter host through cut or wound
1) Releasing enzymes that attack cells.
2) Progressively digest and invade adjacent cells
- some release toxin : Mycotoxin .
Algae --> neurotoxin
-Protozoa --> Malaria , Giardia intestinalis
-Helminth --> Ascaris worm (store alcohol /formalin --> allergic)