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  1. Viral infections are any illness you get from a virus (a small germ that uses your cells to reproduce). Common viral illnesses include colds, the flu, COVID-19, norovirus (“stomach flu”), HPV (warts) and herpes simplex virus (cold sores). Many viruses go away on their own, but some cause life-threatening or chronic illnesses.

  2. Aug 21, 2018 · Some hemorrhagic viral diseases, such as dengue fever and yellow fever, are spread through the bite of an infected insect. ... Viral rashes can affect children and adults alike. Learn how to ...

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  4. Nov 8, 2023 · The symptoms can range from mild to very severe. Other times, your immune system may be able to fight it off and you may not have any symptoms. Each different virus usually only infects one type of cell in your body. For example, hepatitis viruses affect the cells in the liver. HIV infects a certain type of immune system cell.

  5. Dec 18, 2023 · Viral infections occur when your body isn’t able to stop viruses from invading the cells in your body. Viruses spread by coming into contact with infected people, touching contaminated surfaces ...

  6. Nov 20, 2020 · The symptoms of viral diseases can affect almost any area of the body or body system. Symptoms of viral diseases can include: Flu-like symptoms ( fatigue, fever, sore throat, headache, cough, aches and pains) Gastrointestinal disturbances, such as diarrhea, nausea and vomiting. Irritability. Malaise (general ill feeling) Rash.

  7. Mar 27, 2024 · COVID-19, also called coronavirus disease 2019, is an illness caused by a virus. The virus is called severe acute respiratory syndrome coronavirus 2, or more commonly, SARS-CoV-2. It started spreading at the end of 2019 and became a pandemic disease in 2020. Coronavirus Enlarge image.

  8. A virus takes control of the cell it infects and causes it to make more viruses. Viruses usually infect one particular type of cell. For example, common cold viruses infect only cells of the upper respiratory tract. Additionally, most viruses infect only a few species of plants or animals. Some infect only people.

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