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May 2, 2024 · A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. [1] Viruses infect all life forms, from animals and plants to microorganisms, including bacteria and archaea. [2] [3] Viruses are found in almost every ecosystem on Earth and are the most numerous type of biological entity.
- Virus (Disambiguation)
Viruses, the main enemies from Dr. Mario; Viruses, the main...
- Coronavirinae
The earliest reports of a coronavirus infection in animals...
- Computer Virus
Hex dump of the Brain virus, generally regarded as the first...
- Riboviria
Riboviria is a realm of viruses that includes all viruses...
- Infectious Agent
Pathogenicity. Pathogenicity is the potential...
- Dmitri Ivanovsky
Dmitri Iosifovich Ivanovsky (alternative spelling Dmitrii or...
- Introduction to Viruses
Illustration of a SARS-CoV-2 virion. A virus is a tiny...
- History
Electron micrograph of the rod-shaped particles of tobacco...
- Duplodnaviria
Duplodnaviria is a realm of viruses that includes all...
- Viral Evolution
Viral evolution is a subfield of evolutionary biology and...
- Virus (Disambiguation)
2 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.
4 days ago · The history of coronaviruses is an account of the discovery of the diseases caused by coronaviruses and the diseases they cause. It starts with the first report of a new type of upper-respiratory tract disease among chickens in North Dakota, U.S., in 1931. The causative agent was identified as a virus in 1933.
4 days ago · Influenza, acute viral infection of the upper or lower respiratory tract, marked by fever, chills, and a generalized feeling of malaise. Influenza is caused by viruses in the family Orthomyxoviridae. Learn more about the classification of influenza viruses, influenza outbreaks, and influenza symptoms and treatment.
- The Editors of Encyclopaedia Britannica
- What is influenza?Influenza is an acute viral infection of the upper or lower respiratory tract marked by fever, chills, and a generalized feeling of weakness and pa...
- What type of virus causes influenza?Influenza is caused by several closely related viruses in the family Orthomyxoviridae, an RNA virus group. Influenza viruses are categorized as typ...
- What is the difference between influenza epidemics and influenza pandemics?Pandemics are worldwide outbreaks of a disease and are estimated to occur on average once every 50 years for influenza. Epidemics happen much more...
- What is pandemic influenza preparedness?When an influenza pandemic emerges, WHO adheres to its six-phase preparedness plan. Phases 1–3 are the early stages in pandemic preparedness design...
- What are the symptoms of influenza?The symptoms of influenza include sudden and distinct chills, fatigue, and muscle aches. A person’s body temperature rises rapidly to 38–40 °C (101...
3 days ago · Definition. 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. Often, a virus ends up killing the host cell in the process, causing damage to the host ...
May 1, 2024 · The virus is named for the appearance in electron-microscope images of a halolike corona, or crown, around its surface. SARS coronavirus jumped to humans from an animal reservoir, believed to be horseshoe bats. The ability of the SARS coronavirus to jump to humans undoubtedly required genetic changes in the virus.
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Apr 13, 2024 · Viral disease, disease caused by viruses. Long-term immunity usually follows viral childhood diseases (see chickenpox). The common cold recurs into adulthood because many different viruses cause its symptoms, and immunity against one does not protect against others. Some viruses mutate fast enough
