A study was conducted in February 2020, Shenyang, China, which involved 36 COVID-19 positive patients and was classified based on the severity of the symptoms as mild and critical. The results of these patients were compared with that of the patients affected by pneumonia caused by Mycobacterium tuberculosis from Shenyang chest hospital. The study was conducted to determine which one caused severe pneumonia, either the viral or the bacterial strain. Then the severity of tuberculosis was compared between the mild and severe COVID-19 cases and confirmed that tuberculosis due to mycobacterial strain affected patients are more susceptible to COVID-19 and enhance the severity of COVID-19 [124]. Patients with HIV undergoing treatment with antiretroviral medicines exhibit weak immune systems and are more susceptible to viral infections. Also, until now, only one HIV case had been reported with COVID-19 infection from china. The patient recovered from the infection the same as that of those without HIV. There is no evidence on whether HIV patients are more susceptible to COVID-19 infection [125].