Viruses are considered by some biologists to be a life form, because they carry genetic material, reproduce, and evolve through natural selection, although they lack some key characteristics, such …

A virus is a small piece of genetic information in a “carrying case” — a protective coating called a capsid. Viruses aren’t made up of cells, so they don’t have all the equipment that cells do to make more …

Apr 12, 2025 · To understand what a virus truly is, we must explore its structure, its behavior, and the remarkable way it hijacks the machinery of living cells. A virus is a microscopic infectious agent …

3 days ago · A virus is an infectious microbe consisting of a segment of nucleic acid (either DNA or RNA) surrounded by a protein coat. A virus cannot replicate alone; instead, it must infect cells and …

Apr 13, 2026 · Discover more about virus, infections and disease — What are viruses? — What are bacteria? — Could bacteria or viruses lurking in ancient Egyptian mummies unleash a plague today?

2 days ago · Virology is the scientific discipline concerned with the study of the biology of viruses and viral diseases, including the distribution, biochemistry, physiology, molecular biology, ecology ...

Jun 26, 2024 · A virus is a small infectious agent that can only replicate inside the cells of another organism.

Viruses are typically described as obligate intracellular parasites, acellular infectious agents that require the presence of a host cell in order to multiply.

A virus is genetic material contained within an organic particle that invades living cells and uses their host's metabolic processes to produce a new generation of viral particles.

Virus are extremely tiny, even tinier than bacteria, so how do scientists study them? Hannah Gavin, a microbiologist at Harvard, shows us how she does just that in this video.