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Bookmark or Share- Viruses: Definition, Types, Characteristics & Facts - Cleveland ClinicViruses 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:
- Virus - WikipediaA virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. Viruses infect all life forms, from animals and plants to microorganisms, including bacteria and archaea. Viruses are found in almost every ecosystem on Earth and are the most numerous type of biological entity.
- Viruses - National Geographic Societynoun. pathogenic agent that lives and multiplies in a living cell. Viruses are tiny infectious agents that invade host cells and cause disease. Although they are harmful, viruses also have interesting technological potential.
- Viruses: What are they, and what do they do? - Medical News TodaySummary. Viruses are microscopic particles that are present in animals, plants, and other living organisms. They can sometimes cause diseases, such as the flu and COVID-19. Viruses are...
- Intro to viruses (article) | Viruses | Khan AcademyKey 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.
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