Coronavirus disease 2019 (COVID-19) was caused by a novel type of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) It was originated in Wuhan, China in December 2019 It spreads rapidly all over the world since respiratory virus infection can occur through many easy ways (e g contact, droplet spray, aerosol) and besides, asymptomatic people also have contagiousness So far, there have been 23,491,520 confirmed cases of COVID-19, including 809,970 deaths, reported to World Health Organization (WHO), which declared it as a significant threat to global health Fever, fatigue, and dry cough are the commonly observed symptoms in the patients In COVID-19, the main affected system is respiratory system and some cases demonstrate a rapid progression to acute respiratory distress syndrome (ARDS), while other organs are less involved Angiotensin-converting enzyme 2 receptor-virus association is essential and responsible for the development of the disease SARS-CoV-2 causes deaths through its severe effects on the respiratory system
Effects of COVID-19 on respiratory system