Analysis of viral load in different specimen types and serum antibody levels of COVID-19 patients

Background COVID-19 has caused a global pandemic and the death toll is increasing. However, there is no definitive information regarding the type of clinical specimens that is the best for SARS-CoV-2 detection, the antibody levels in patients with different duration of disease, and the relationship between antibody level and viral load. Methods Nasopharyngeal swabs, anal swabs, saliva, blood, and urine specimens were collected from patients with...