Knowledge is the key!
Knowing what the symptoms of the COVID-19 are will only help to prevent the spread.
1st source CDC:
https://www.cdc.gov/coronavirus/2019-ncov/symptoms-testing/index.html#cdc-chat-bot-open
People may be sick with the virus for 1 to 14 days before developing symptoms. The most common symptoms of coronavirus disease (COVID-19) are fever, tiredness, and dry cough. Most people (about 80%) recover from the disease without needing special treatment.
More rarely, the disease can be serious and even fatal. Older people, and people with other medical conditions (such as asthma, diabetes, or heart disease), may be more vulnerable to becoming severely ill.
People may experience:
cough
fever
tiredness
difficulty breathing (severe cases)
2nd source Mayo Clinic:
https://www.mayoclinic.org/diseases-conditions/coronavirus/symptoms-causes/syc-20479963
Symptoms
Signs and symptoms of COVID-19 may appear two to 14 days after exposure and can include:
- Fever
- Cough
- Shortness of breath or difficulty breathing
Other symptoms can include:
- Tiredness
- Aches
- Runny nose
- Sore throat
Some people have experienced the loss of smell or taste.
3rd source John Hopkins Medicine:
https://www.hopkinsmedicine.org/coronavirus/covid-19-self-checker.html
You have to take a test.