Subcellular organisms that are among the smallest known disease-causing microorganisms are called viruses.
In the field of biology, a virus can be described as a tiny microbe that can replicate itself using the host machinery. Outside a host organism, the virus cannot replicate. Scientists still debate whether to consider viruses as living or non-living structures. They are smaller than all other microorganisms.
A virus is an infectious agent which can even kill the host organism when uses its replication machinery. Viruses are known to cause various diseases in plants, animals, fungi, and humans.
The structure of a virus is simple, consisting of a DNA or RNA which is encapsulated by a protein structure known as a capsid. An envelope is an additional structure that may be present in some of the viruses. Examples of viruses include the tobacco mosaic virus, herpes virus, influenza virus, etc.
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