I don’t know exactly but what i have read on WHO and NIH website i will explain here for information purpose only.
Coronavirus disease (COVID-19) is an infectious disease caused by a newly discovered coronavirus.
Most people infected with the COVID-19 virus will have mild to moderate respiratory disease and will recover without the need for special treatment. Older people with underlying medical conditions, such as cardiovascular disease, diabetes, chronic respiratory diseases and cancer, are more likely to develop serious illnesses.
The best way to prevent and delay transmission is to be well informed about the COVID-19 virus, the disease it causes and how it spreads. Protect yourself and others from infections by washing your hands or using an alcohol-based disinfectant frequently and without touching your face.
The COVID-19 virus spreads mainly through droplets of saliva or runny nose when an infected person coughs or sneezes, so it is important that you also practice breathing etiquette (for example, coughing with your flexed elbow).
Symptoms can appear 2 to 14 days after exposure to the virus. People with these symptoms may have COVID-19:
Fever or chills
Shortness of breath or difficulty breathing
Muscle or body aches
New loss of taste or smell
Clogged or runny nose
Nausea or vomiting
Look for the emergency warning signs for COVID-19. If someone shows any of these signs, seek emergency medical attention immediately:
Persistent chest pain or pressure
Inability to wake up or stay awake
Bluish lips or face
To help prevent the spread of COVID-19, everyone should:
Wash your hands frequently, either with soap and water for 20 seconds or with a hand sanitizer that contains at least 60% alcohol.
Avoid close contact with sick people.
Put distance between you and other people (at least 6 feet).
Avoid indoor spaces that do not offer as much fresh air outside as possible. If you are indoors, bring fresh air by opening the windows and doors, if possible.
Cover your mouth and nose with a mask when you are around other people.
Cover your cough or sneeze with a tissue and throw it away.
Clean and disinfect frequently touched objects and surfaces daily.
The CDC recommends that people wear masks in public settings and when they are around people outside the home, especially when other measures of social distance are difficult to maintain.
Masks can help prevent people with COVID-19 from spreading the virus to others.
If you have possible or confirmed COVID-19:
Stay at home, except for medical care.
Monitor your symptoms carefully. If your symptoms get worse, call your doctor right away.
Rest and stay hydrated. Take over-the-counter medications, such as acetaminophen, to help you feel better.
If you have a medical appointment, notify your doctor in advance that you have or may have COVID-19.
Stay in a specific room and away from other people in your home. If possible, use a separate toilet. If you need to be around other people, wear a mask.