Viruses are microscopic infectious agents that exist at the boundary between living and non-living matter. While they possess genetic material and can evolve, they lack the cellular machinery required for independent metabolism and reproduction, making them . Since their discovery as "filterable agents" in the late 19th century, viruses have shifted from being viewed solely as pathogens to being recognized as essential drivers of biological evolution and powerful tools in modern biotechnology. 2. Viral Structure and Classification
A complete, infectious virus particle is known as a . Its core structure typically includes: Viruses are microscopic infectious agents that exist at
Structure and Classification of Viruses - Medical Microbiology Viruses are microscopic infectious agents that exist at
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