If there is fever, cough and other discomfort, it is recommended to conduct self-test first. If the following conditions are met, observation at home can be done first: 1. the body temperature does not exceed 38℃ and there are no obvious symptoms such as shortness of breath and breath-holding; 2. the age is below 60 years old or above 5 years old; 3. not pregnant women, patients with chronic diseases or obese people. When the following conditions occur, prompt medical consultation is recommended: 1, no improvement after 1-2 days of rest at home; 2, recent close contact with patients with fever or cough, or have been to crowded places; 3, belong to the elderly, pregnant women, obese people, have underlying diseases or low immune function, etc.