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Pathogenic diseases are caused by what is called a pathogen. Pathogens are parasitic organisms that cause disease int heir host. There are five different groups of pathogens: Viruses, bacteria, fungi, protozoans and parasitic worms.

Deficiency diseases are just as the name suggests. They are caused by a deficiency of a particular nutrient in the diet.

Hereditary diseases are passed on through generations via their genes. For example, haemophilia and sickle cell disease. They cannot be cured.

Physiological diseases are caused by the failure or malfunction of body parts or organs

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