According to Medical Xpress, researchers from Harvard University have developed a new portable diagnostic device the size of a postcard that can accurately detect the new coronavirus and antibodies in saliva samples from infected people at the same time. The researchers said that this kind of portable can not only improve the efficiency of nucleic acid detection, save people's queuing time, but also reduce the cost of nucleic acid to a certain extent. At the same time, the accuracy of the test results of this device is comparable to that of the laboratory. Such testing could significantly improve the world's ability to respond to future epidemics and provide patients with different treatment options.