Abstract
Since its emergence as a major cause of coronavirus pneumonia, SARS-CoV-2 has spread quickly all over the world. The pandemic has affected all aspects of life and continues to spread despite the stringent control measures. Meanwhile, scientists all around the world have been scrambling to ascertain how the virus spreads and find out the effective ways to put this outbreak quickly under control, focusing on both persistent strict domestic interventions and vigilance against exogenous imported cases (1,2). Several cases of family clusters have been reported and evidence of person-to-person transmission has been confirmed. Indicating the importance of early detection and isolation of infected patients (3,4). Hence then special caution is needed for asymptomatic patients particularly for family members.