The query "what are" is incomplete, but based on the context of the search results, it seems you might be asking about COVID-19 symptoms or the nature of the coronavirus. Here is a concise summary based on the information available:
What Are the Symptoms of COVID-19?
COVID-19 symptoms can vary widely but commonly include:
- Fever or chills
- Cough
- Shortness of breath or difficulty breathing
- Fatigue
- Muscle or body aches
- Headache
- New loss of taste or smell
- Sore throat
- Congestion or runny nose
- Nausea or vomiting
- Diarrhea
These symptoms can appear 2-14 days after exposure to the virus. Some people may have mild symptoms or be asymptomatic, while others, especially older adults or those with certain medical conditions, can develop severe illness requiring hospitalization
What Is a Coronavirus?
Coronaviruses are a large family of viruses that can infect humans and animals. The virus causing COVID-19 is called SARS-CoV-2. Key parts of the virus include:
- RNA genome: The virus's genetic material
- Nucleoproteins: Help structure and replicate the virus
- Viral envelope: A lipid layer protecting the virus outside host cells
- Spike proteins: Protrusions that allow the virus to attach and enter human cells, giving the virus its crown-like appearance under a microscope
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