There should be an intense effort in determining more closely what are the underlying factors for severity of host response towards SARS-COV-2 infection. We know that some of these are genetic such as the blood group, but many are acquired.
A new study involving over 92,000 patients with COVID-19 in Brazil shows that the odds of severe disease, ventilatory support requirement, and death are reduced with a recent trivalent flu vaccine. This seems to indicate that these vaccines should be used as widely as possible to reduce the risk of severe COVID-19, especially among high-risk groups. (The study is published on the pre-print server medRxiv* in June 2020).
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