Nicollette Sheridan
Marissa Blumenthal
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Apr 12, 2024 · 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.
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.
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Viruses are small germs (pathogens) that can infect you and make you sick. They can infect humans, plants, animals, bacteria and fungi. Each one infects only specific types of hosts. Viral infections in humans can cause no symptoms or make you extremely ill. Types of diseases they can cause include:
Coronavirus disease (COVID-19) is an infectious disease caused by the SARS-CoV-2 virus. Most people infected with the virus will experience mild to moderate respiratory illness and recover without requiring special treatment. However, some will become seriously ill and require medical attention.
What are viruses? Sources. Transmission. When viruses change. Viral diseases. COVID-19. Tackling viruses. Treatment. Vaccines. Summary. Viruses are microscopic particles that are present in...
Key points: A virus is an infectious particle that reproduces by "commandeering" a host cell and using its machinery to make more viruses. A virus is made up of a DNA or RNA genome inside a protein shell called a capsid. Some viruses have an external membrane envelope. Viruses are very diverse.
Mar 13, 2020 · What is a virus? How do they spread? How do they make us sick? Published: March 12, 2020 11:42pm EDT. This illustration shows the shape of a coronavirus particle. CDC / Alissa Eckert, MS; Dan...
