Influenza immunization and COVID-19 – can viral structure be responsible for the effect?

I would like to express gratitude for reader's interest in previously published manuscript entitled “Pneumonia in medical professionals during COVID-19 outbreak in cardiovascular hospital” in International Journal of Infectious Diseases (Ilic et al., 2021).
Source: International Journal of Infectious Diseases - Category: Infectious Diseases Authors: Tags: A letter to the editor Source Type: research