This article is about the aqueous solution. For the gas, see hydrogen chloride. Hydrochloric acid is a corrosive, strong mineral acid with many industrial uses. A colorless, highly pungent solution of hydrogen chloride (HCl) in water, when it reacts with an organic base it forms a hydrochloride salt.
Bacteria are intercellular organisms (i.e. they live in-between cells); whereas viruses are intracellular organisms (they infiltrate the host cell and live inside the cell). They change the host cell's genetic material from its normal function to producing the virus itself.
Definition of Bacteria & Viruses. When you get sick, it's probably because of a bacterium or virus. Bacteria and viruses are agents that can be dangerous to humans and other animals. But bacteria and viruses are actually very different from each other. Bacteria are single-celled organisms that are alive, and can live inside the human body.