This study states that The influenza virus contributes significantly to the number of hospital admissions during the annual outbreak months. Among the existing viral pathogens, influenza remains the most clinically significant viral cause of community-acquired pneumonia in adults, and it is a key cause of hospital-acquired pneumonia.1 However, the impact of each influenza epidemic on morbidity and mortality varies considerably depending on the prevalence of the influenza virus in each season. Since 2009, following the new influenza A (H1N1) pdm09 virus pandemic, the use of rapid polymerase chain reaction (PCR) tests on respiratory samples has been extended in hospitals.2 Outbreaks of nosocomial infection usually occur during the seasons of community infection, predominantly in units with hematological and immunosuppressed patients.3-6 Comorbidities such as chronic bronchitis, immunosuppression,7 diabetes, chronic kidney disease, nosocomial infection,8 and malnutrition9 have been previously described as a risk factors associated with complications like septic shock, need for mechanical ventilation, admission in intensive care unit (ICU) and death. However, only few studies have been conducted on the sporadic nosocomial cases of influenza and their associated complications, with complete clinical and virologic data.

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