Page:Bacteria, why do they make me sick?.pdf/17



Viruses are organisms that have genetic material protected by a protein structure.

This microscopic organism can cause different diseases when it goes inside a cell and reproduces himself in it.

However, Infection does not necessarily lead to disease. If the host’s immune system acts appropriately, the person can be infected not having the symptoms. Additionally, bacteria are not the only microorganisms able to make human beings sick. There are also different pathogen viruses, such as flu viruses. 17