Size

Viruses are the simplest and smallest form of biological organisms. They are 10 to 100 times smaller than bacteria. An ordinary light microscope is no longer sufficient to recognize them; an electron microscope is required instead.

Structure

Viruses are very simple. They consist of genetic materials surrounded only by a protein shell. However, the simple nature of viruses does not indicate that they are easier to treat. On the other hand, bacteria have a more complex structure. Genetic material and ribosomes or mitochondria are located in the cell surrounded by a complex cell wall that allows exchange with the environment.

Metabolism

Unlike viruses, bacteria are a form of biological organisms, because bacteria have their own metabolism. Viruses, however, rely on the metabolism of a host.

Reproduction

In terms of reproduction, the biggest difference between bacteria and viruses is that bacteria multiply by cell division. Viruses cannot reproduce on their own. Therefore, they need a host, such as the human body that helps them reproduce. However, viruses can survive up to 48 hours on surfaces and can be infectious.