Difference between Virus and Bacteria

The very simple difference between Virus and Bacteria is that Virus is smaller than a bacteria WHILE a Bacteria is larger than a virus. The worthy thing to mention here is that bacteria is considered a fully functional microorganism while a virus lacks characteristics of a fully functional organism.

Difference between Virus and Bacteria

Organisms are classified into two major categories Eukaryotes and Prokaryotes. Eukaryotes are those organisms having the nucleus in their cells but Prokaryotes do not have a nucleus in their cells. According to biological researches, prokaryotes are classical organisms and came to existence before eukaryote. Bacteria is prokaryote while a virus cannot be yet considered a prokaryote or a eukaryote.

Difference between Virus and Bacteria in the column:

Virus Bacteria
1. It is much smaller than bacteria, and its recorded size is 20-200 nm It is larger than a virus and its recorded size is nearly 1000 nm.
2. These are always infectious and are not human friendly. These are not always infectious there are some bacteria that are human friendly and even help In digestion.
3. Cannot be considered either prokaryote or eukaryote There are both eukaryotic and prokaryotic bacteria.
4. It can even infect bacteria It cannot infect virus.
5. It cannot be considered as a parasite. It can be considered as a parasitic organism.
6. It always requires a host cell for its replication/reproduction. It does not always require a host cell for reproduction in fact It can reproduce on their own using the asexual method of reproduction.
7. Antibiotics cannot kill viruses. There is a wide range of antibiotics that kills bacteria.
8. These are very simple in structure with having only DNA or RNA packaged inside a membranous or protein coat. These have a complex structure including many cell organelles and DNA or RNA inside the nucleus or freely moving without a nucleus.
9. Illnesses caused by this include Chickenpox, Influenza, Common cold, AIDS, SARS, MERS, Cholera, Plague, Hepatitis, Measles, Ebola, herpes, and rabies. Illnesses include: Food poisoning, Meningitis, Ear infection, Pneumonia, Strep throat, and gonorrhea
10. There is no virus in a human body if present then it could be an alarming situation. There is a large number of bacteria inside the human body to more than the number of humans cells.
11. Viral infections are always contagious. Bacterial infections are not always contagious.



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