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