Members of the families parvoviridae and picornaviridae with the majority of viruses ranging between 10 and 300nm in diameter. The largest viruses known the pandoraviruses are about 1000 nanometers or a full micrometer in size.
Although research studies have revealed that some viruses are very large in size e g.
Virus vs bacteria size. Bacteria are single celled organisms. They are non living outside the host and partially living inside the host. They are so small that they cannot be seen under a light microscope and need an electron microscope to be studied.
Bigger in size and can be seen by a light microscope. That it is not cell but just a particle. Bacteria are giants when compared to viruses.
The smallest bacteria are about 0 4 micron one millionth of a meter in diameter while viruses range in size from 0 02 to 0 25 micron. Viruses are much smaller than bacteria and range from about 0 015 0 2 μm. Some of the smallest viruses may range from 20 to 30 nm in diameter e g.
The mimivirus is about 750nm in diameter viruses are generally very small when compared to bacteria. They are typically studied with an electron microscope. They generally range in size from 20 400 nanometers in diameter.
Viruses are much smaller than bacteria. This makes most viruses submicroscopic unable to be seen in an ordinary light microscope.
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