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2 days ago · Learn about viruses, submicroscopic infectious agents that replicate only inside living cells. Find out how viruses are classified, how they infect and spread, and how they evolve and interact with life forms.
Sep 13, 2024 · Learn about viruses, infectious agents of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria. Explore their history, classification, structure, and role in diseases and ecology.
- A virus is an infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria.
- A virus particle is made up of genetic material housed inside a protein shell, or capsid. The genetic material, or genome, of a virus may consist o...
- Most viruses vary in diameter from 20 nanometres (nm; 0.0000008 inch) to 250–400 nm. The largest viruses measure about 500 nm in diameter and are a...
- Shapes of viruses are predominantly of two kinds: rods (or filaments), so called because of the linear array of the nucleic acid and the protein su...
- When some disease-causing viruses enter host cells, they start making new copies of themselves very quickly, often outpacing the immune system’s pr...
4 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 use components of the host cell to make copies of itself.
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5 days ago · Viral throat infections are caused by viruses such as the common cold, influenza, and Epstein-Barr virus (which causes mononucleosis). These infections typically resolve on their own without the need for antibiotics. Symptoms of viral throat infections often include a sore throat, cough, runny nose, and sometimes fever.
3 days ago · The earliest reports of a coronavirus infection in animals occurred in the late 1920s, when an acute respiratory infection of domesticated chickens emerged in North America. [15] Arthur Schalk and M.C. Hawn in 1931 made the first detailed report which described a new respiratory infection of chickens in North Dakota.
3 days ago · influenza, an acute viral infection of the upper or lower respiratory tract that is marked by fever, chills, and a generalized feeling of weakness and pain in the muscles, together with varying degrees of soreness in the head and abdomen.
Sep 13, 2024 · Virus - Infection, Host, Replication: Viruses can reproduce only within a host cell. The parental virus (virion) gives rise to numerous progeny, usually genetically and structurally identical to the parent virus. The actions of the virus depend both on its destructive tendencies toward a specific host cell and on environmental conditions.
