factors associated with it in critical COVID-19 patients, and to identify the most common
pathogen groups in them. All the cohort studies were retrieved from Scopus, Google
Scholar, Web of Science, and MEDLINE from the inception of COVID-19 to 2022 for the
following keywords:'Klebsiella" AND" COVID-19". The most common comorbidities among
the patients with COVID-19 were respiratory disease (33.62%), obesity (28.99%), and heart …