A virus is a small infectious agent that can only replicate inside the cells of living organisms. Viruses can infect all types of life forms, including animals, plants, and bacteria. They are made up of genetic material (either DNA or RNA) enclosed in a protein coat called a capsid. Viruses can cause a wide range of diseases in their hosts, from the common cold to more serious illnesses like HIV, influenza, and COVID-19.
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Google Gemini AI
Jun 11
Definition:
A virus is a tiny microorganism that can cause disease in living organisms, including plants, animals, and humans.
Characteristics:
- Not independent: Viruses are not living cells and require a host cell to replicate. - Genetic material: Viruses contain genetic material (DNA or RNA) enclosed in a protein coat. - Size: Viruses are extremely small, typically ranging from 20 to 400 nanometers in diameter. - Structure: Viruses have a simple structure consisting of the genetic material enclosed within a capsid (protein shell). Some viruses have an additional outer envelope derived from the host cell membrane. - Replication: Viruses do not have the machinery to reproduce independently. They must infect a host cell and use its cellular machinery to make copies of themselves.
Transmission:
Viruses can be transmitted through various means, including:
- Direct contact with infected individuals or their bodily fluids - Contaminated surfaces or objects - Airborne droplets (e.g., from coughs or sneezes) - Animal bites or insect vectors
Symptoms:
Viral infections can cause a wide range of symptoms, depending on the virus and the individual infected. Common symptoms include:
- Fever - Cough - Sore throat - Runny nose - Fatigue - Body aches - Nausea and vomiting - Diarrhea - Skin rashes
Prevention and Treatment:
Prevention of viral infections involves:
- Vaccination - Hand hygiene - Avoiding close contact with infected individuals - Proper disposal of bodily fluids
Treatment for viral infections typically focuses on:
- Relieving symptoms - Preventing complications - In some cases, antiviral medications
Importance:
Viruses have a significant impact on global health and play a role in various diseases, including: