Kovid 19 disease

Coronavirus disease 2019 (COVID-19) is an infectious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).^[9] It was first identified in December 2019 in Wuhan, China, and has since spread globally, resulting in an ongoing pandemic.^[10][11] As of 9 May 2020, more than 3.93 million cases have been reported across 187 countries and territories, resulting in more than 274,000 deaths. More than 1.31 million people have recovered.^[8]

Common symptoms include fever, cough, fatigue, shortness of breath, and loss of smell and taste.^[5][12][13] While the majority of cases result in mild symptoms, some progress to acute respiratory distress syndrome (ARDS), multi-organ failure, septic shock, and blood clots.^[14][15][16] The time from exposure to onset of symptoms is typically around five days but may range from two to fourteen days.^[5][17]

The virus is primarily spread between people during close contact,^[a] often via small droplets produced by coughing,^[b] sneezing, and talking.^[6][18][20] The droplets usually fall to the ground or onto surfaces rather than remaining in the air over long distances.^[6]People may also become infected by touching a contaminated surface and then touching their face.^[6][18] On surfaces, the amount of virus declines over time until it is insufficient to remain infectious, but it may be detected for hours or days