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Mar 29, 2023 · 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:
Aug 25, 2018 · A virus is a chain of nucleic acids (DNA or RNA) which lives in a host cell, uses parts of the cellular machinery to reproduce, and releases the replicated nucleic acid chains to infect more cells.
Jun 21, 2023 · Common examples of contagious viral diseases include the flu, the common cold, HIV, and herpes. Other types of viral diseases spread through other means, such as the bite of an infected...
Apr 21, 2023 · Influenza and SARS-CoV-2 are two examples of viruses that can spread in this way. Direct contact: Some viruses may spread through direct contact with a person that has the virus.
Viruses can be divided into two groups: one group of viruses spreads only between humans, and the other group mainly spreads between animals and may spread to humans. Drastic population increase and worldwide drought led to widespread deforestation, in order to acquire more farming land and wood.
Many viruses spread in the air by coughing and sneezing, including influenza viruses, SARS-CoV-2, chickenpox, smallpox, and measles. Norovirus and rotavirus, common causes of viral gastroenteritis, are transmitted by the faecal–oral route, passed by hand-to-mouth contact or in food or water.
Feb 17, 2023 · This article will cover what viruses are, the different types of viruses, how viruses work, some common virus examples, virus symptoms, treatment, and prevention.
Jun 18, 2024 · What are viruses made of? What size are viruses? Are all viruses spherical in shape? Why are some viruses dangerous?
Oct 19, 2023 · Viruses generally come in two forms: rods or spheres. However, bacteriophages ( viruses that infect bacteria) have a unique shape, with a geometric head and filamentous tail fibers. No matter the shape, all viruses consist of genetic material ( DNA or RNA) and have an outer protein shell, known as a capsid.
Examples of retroviruses are the human immunodeficiency viruses and the human T-cell leukemia viruses. Once the provirus is integrated into the host cell DNA, it is transcribed using typical cellular mechanisms to produce viral proteins and genetic material.
