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23 Νοε 2022 · 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.
21 Απρ 2023 · Viruses are biological entities that can only thrive and multiply in a host, which is a living organism such as a human, an animal, or a plant. Some viruses cause disease. For example, severe...
8 Νοε 2023 · Viruses cause familiar infections such as the common cold, but they also cause severe illnesses. Learn more about viral infections and their symptoms.
17 Φεβ 2023 · Some viruses cause sickness, like common colds, the flu, and food poisoning. Symptoms of a viral infection include fever, pain, nausea, diarrhea, cough, congestion, shortness of breath, rashes, warts, and many others.
13 Μαρ 2020 · A virus that replicates like crazy and kills its host very quickly may not have an opportunity to spread to a new host. On the other hand, a virus that replicates slowly and causes little...
Typical COVID-19 symptoms often show up 2 to 14 days after contact with the virus. Symptoms can include: Dry cough. Shortness of breath. Loss of taste or smell. Extreme tiredness, called fatigue. Digestive symptoms such as upset stomach, vomiting or loose stools, called diarrhea. Pain, such as headaches and body or muscle aches. Fever or chills.
30 Ιαν 2023 · Viruses are obligate, intracellular parasites. A virus must first recognize and attach to a specific living cell prior to entering it. After penetration, the invading virus must copy its genome and manufacture its own proteins. Finally, the progeny virions must escape the host cell so that they can infect other cells.
