All diseases are caused by pathogens,
Pathogens are not a disease, but the thing that causes the disease.
Pathogens contain foreign molecules (antigen).
(eg. virus and bacteria)
Bacteria contains one single chromosome.
Bacteria release poisons called toxins.
Bacteria have flagella (tiny hairs) to help them move.
(eg. food poisoning, typhoid, cholera)
Virus' are smaller than bacteria.
Virus' can only reproduce…