Figure 1.

Prevalence of secondary bacterial infection among severely ill COVID-19 patients. 217 patients were recruited in this study. 142 patients developed secondary bacterial infections. The microbiology analysis showed that different microbial species were isolated either from blood or respiratory cultures. The majority of infections were caused by Gram-negative bacteria, and Klebsiella species were the most common organism detected either in blood or respiratory cultures (A, B). High incidences of Gram-positive bacteria were also identified and coagulase-negative staphylococcus species were the dominant Gram-positive bacteria in blood cultures, and S. aureus was the predominant organism in respiratory cultures (C, D). In several occasions, multiple microorganisms were isolated from one patient.