www.cebm.net/covid-19/rapidly-managing-pneumonia-in-older-people-during-a-pandemic/?fbclid=IwAR0T-7dPzxRRG9xylgNUdOtXFNjsohSqv0RIIZrqbYnbswpo0oVgM7GP6J0
Couple of things that stand out:
Coronavirus causes inflammatory damage in the lungs, preventing clearance of bacteria.
Secondary bacterial infection worsens prognosis. Most deaths in the influenza pandemics of 1918, 1957, and 1968 were caused by secondary bacterial infections (I had no idea about this--this is very interesting!).
Concurrent bacterial pneumonia was highlighted as a particular problem in elderly people in the 2003 SARS outbreak.
Perhaps we all need to asking questions about hospital hygiene and overuse of antibiotics in the past few decades. It's already being speculated in a lot of quarters that Italy's unusually high death rates were partly due to the fact that Italy is the worst in Europe when it comes to antibiotic-resistant strains of bacteria.
There is also talk that fatalities in Japan have in part been unexpectedly low due to universal vaccination against pneumococcal pneumonia in the elderly. I have heard some rumors that the strain of TB vaccination that is given in East Asia may be connected with low death rates in many of these countries.