Two bars of antigen generally refers to two bars of nucleic acid antigen test for new coronavirus, which means the result of nucleic acid antigen test is positive, which means there is a possibility of infection with the new coronavirus, and it is recommended that the patient undergoes nucleic acid test again to make a clear diagnosis when the result occurs. Nucleic acid antigen test with two bars generally means that the nucleic acid antibody test result is positive, which means that the patient may be infected with the new coronavirus, but the nucleic acid antigen test result can only be used as an aid in confirming the diagnosis of infection with the new coronavirus, and can not be used as a criterion for confirming the diagnosis. It is recommended that after two bars appear in the nucleic acid antigen test, the examiner needs to go to the hospital for throat swab or nasal swab nucleic acid test in a timely manner. For those who have positive nucleic acid antigen test need to seek medical attention in time to do nucleic acid test and lung imaging again to clarify whether they are infected with novel coronavirus. If the patient is confirmed to be infected with novel coronavirus, he/she needs to be isolated and treated according to medical advice.