Background
Coronavirus disease 2019 (COVID-19) was first reported in Wuhan, China. This is the consequence of SARS-CoV-2 virus. As prevalence of the disease increased all around the world, by March 11, 2020, World Health Organization (WHO) declared it as a pandemic disease [1]. Influenza virus is an encapsulated single-stranded RNA virus which infects the epithelium of the airways. Influenza type-1 can result in seasonal flu and about 5-10% of adults will be exposed to it annually [2]. Clinical presentation of COVID-19 is similar to that of influenza virus infection. Influenza is known to cause coinfection with other respiratory infections [3]. Influenza infection presents with symptoms such as high-grade fever, cough, myalgia and rhinorrhea [4]. Studies suggest that coinfection with many respiratory pathogens is common. Coinfection with two viruses can affect the host and bring about synergism and as a result, considerably influence the disease pathogenesis, immune system responses as well as the treatment outcome [2]. Respiratory viral infections such a COVID-19 and influenza have very similar symptoms which can make problems such as delayed diagnosis and treatment [5]. Here, we report three cases of COVID-19 and influenza coinfection whose PCR tests were positive for both diseases. After treatment, all three cases were discharged with satisfactory general conditions.