COVID-19 is a contagious disease caused by a zoonotic virus called severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) which mainly infects cells in the respiratory tract, but can also have effects on all organs. Coinfection with SARS-CoV-2 and other microorganisms such as viruses, bacteria and fungi is an important factor in the treatment of COVID-19 because this condition can improve diagnosis, treatment, prognosis and mortality rates. Bacterial coinfection can occur in hospitalized COVID-19 patients, especially in the ICU and has a worse prognosis compared to patients without bacterial infection. Gram-negative bacteria are more commonly found to cause bacterial co-infections than gram-positive bacteria.