- Virus - Wikipedia
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 as cell structure, that are generally considered necessary criteria for defining life
- A nasty, hard-to-kill virus is spreading across the country . . .
A nasty, highly contagious virus is spreading across the country ahead of the holiday season — and it’s not the flu or Covid Norovirus, also called the “winter vomiting disease,” has been
- Virus | Definition, Structure, Facts | Britannica
Virus, infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria Viruses possess unique infective properties and thus often cause disease in host organisms Learn about the history, types, and features of viruses
- Viruses: Definition, Types, Characteristics Facts
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 copies of themselves
- As Norovirus and Flu Cases Rise, Know These Symptoms to Tell . . .
Seasonal flu and norovirus are circulating right now But which illness do you have? Doctors share what to look for when comparing norovirus vs flu symptoms
- What Is a Virus? Definition, Structure, and How Viruses Work
When a virus enters the body, the innate immune system reacts first This non-specific defense includes barriers like skin, as well as cells that engulf and destroy invaders If the virus gets past this line, the adaptive immune system takes over
- Virus - National Human Genome Research Institute
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 use components of the host cell to make copies of itself
|