Infect or invade the body and attack cells and tissues.

These bacteria live in the soil.

One –celled microscopic organisms that rank among the most widespread of living things .

Blood sucking insects such as lice, mites and ticks

This type of pathogen is found in yeast and mushrooms.

Human body’s worst enemies.

Most of these are harmless and most in tropical areas that have poor sanitation.

This type pf parasitic worms Live in the intestines.

Also called seat worms and threadworms.