A special case of COVID-19 with long duration of viral shedding for 49 days

Li Tan; Xia Kang; Bo Zhang; Shangen Zheng; Bo Liu; Tiantian Yu; Fan Yang; Qiongshu Wang; Hongming Miao

Furthermore, though his another relative also got fever at the time of visit, the viral test was negative, indicating the virus may be promptly cleared off or this contact was not infected. While genetic mutations may be considered to contribute to the mild signs in this family cluster case, one more important thing is other four close contacts who do not have any blood relationship with Case 1 even were not infected after contact. Recently, one study found ABO blood group is a new risk factor for severity of patients with COVID-19. People with blood group A have a higher risk and the patients with blood group O have a lower risk than other groups 11 . However, the blood group of Case 1 is group AB . CC-BY-NC-ND 4.0 International license It is made available under a is the author/funder, who has granted medRxiv a license to display the preprint in perpetuity.