Positive and negative for new types of pneumonia i.e. nucleic acid tests. If a positive nucleic acid test is found at the early screening stage, it suggests a possible infection and confirms the diagnosis based on a positive nucleic acid test. If there is an epidemiologic history, clinical symptoms, and a positive nucleic acid test, the diagnosis of infection can be confirmed. If the test is negative, the absence of infection cannot be ruled out. False-negative tests are possible, depending on the sensitivity of the reagents and the accuracy of the specimen sampled. For suspected cases, there is an epidemiologic history, supported by clinical symptoms, and if a single negative test cannot be ruled out, at least two negative tests are required, and the two tests must be separated by 24 hours before they can be ruled out. Antibody testing has been added to the new protocol, requiring that suspected cases be more than 7 days old, and that nucleic acid-negative and antibody-negative tests be used to rule out the disease. Positive and negative nucleic acid tests are used to differentiate between infected patients who have been diagnosed. If the nucleic acid test changes from positive to negative, it means that the amount of virus in the body has decreased. A confirmed case that improves after treatment and has two negative tests is discharged from the hospital. In some areas, sputum nucleic acid test and fecal nucleic acid test are recommended, both of which are negative to prove that the patient is not infectious and can be discharged from the hospital. Source: Dr. Yurai