Do we know what percentage of hospitalised COVID-19 patients develop a secondary bacterial infection?
There are very few reports which record the frequency of secondary bacterial infections such as bacterial pneumonia. In a large meta-analysis, (that’s where data from a number of studies is combined and analysed) numbers of around 7% were reported (details here). On the other hand, anecdotal evidence during the current COVID-19 pandemic from two English large city hospitals suggest a figure of around 20 – 30%. However, because of our inability to obtain this information in real time, we won’t ever know exact numbers of patients affected with a secondary bacterial infection.