Use of these tests: 
1)The first-visit suspected patients(no molecular results or molecular negative), if antibody positive, should be managed as confirmed case; if antibody negative, it suggests to do PCR again, and test antibody after one week. 
2)The asymptomatic close contacts or investigation crowd, if antibody positive, no matter how the PCR result is, should be managed as carriers; if antibody negative, it suggests to do PCR firstly and follow up with antibody detection, it can be excluded from  infection if results negative again. 
3) For asymptomatic quarantined-14-days people, if antibody positive, it suggests to do PCR again and be kept under observation. 
All test results need to be combined with the patient's clinical symptoms and signs, and the interpretation of the test results must follow the local diagnostic guidelines in each country. 
Regerence: Diagnosis and treatment plan for the novel  disease,http://ahkangtong.en.made-in-china.com