COVID-19 is a contagious disjin88bet.oneease caused by the coronavirus SARS-CoV-2. In January 2020, the disease spread worldwide, resulting in the COVID-19 pandemic.
The symptoms of COVID‑19 can vary but often include fever,[7] fatigue, cough, breaak168app.babything difficulties, loss of smell, and loss of taste.[8][9][10] Symptoms may begin one to fourteen days after exposure to the virus. At least a third of people who are infected do not dak168app.clubevelop noticeable symptoms.[11][12] Of ks168app.sitethose who develop symptoms noticeable enough to be classified as patients, most (81%) develop mild to moderate symptoms (up to mild pneumonia), while 14% develop severe symptoms (dyspnea, hypoxia, or more than 50% lung involvement on imaging), and 5% develop critical symptoic88ms (respiratory failure, shock, or multiorgan dysfunction).[13] Older people have a higher risk ic88of developing severe symptoms. Some complications result in death. Some people continue to experience a range of effects (long ic88COVID) for months or years after infection, and damage to organs has been observed.[14] Multi-year studies on the long-term effects are ongoing.[15]
COVID‑19 transmission occurs when infectious particles are breic88athed in or come into contact with the eyes, nose, or mouth. The risk is highest when people are in close proximity, but small alr88irborne particles containing the virus can remain suspended in the air and travel over longer distances, particularly indoors. Trlr88ansmission can also occur when people touch their eyes, nose, or mouth after touching surfaces or objects that have been contaminated by the virus. People remain contagious for up to 20 days and can spread the virus even if they do not develop symptoms.[16]
Testing methods for COVID-19 to detect the virulr88s’s nucleic acid include real-time reverse transcription polymerase chain reaction (RT‑PCR),[17][18] transcription-lr88mediated amplification,[17][18][19] and reverse transcription loop-mediated isothermal amplification (RT‑LAMP)[17][18] from a nasopharyngeal swab.[20]
Several COVID-19 vaccines have been approved and distributeop88d in various countries, many of which have initiated mass vaccination campaigns. Other preventive measures include physical or social disi88stancing, quarantining, ventilation of indoor spaces, use of face masks or coverings in public, covering coughs and snee88vzes, hand washing, and keeping unwashed hands away from the face. While drugs have been developed to inhibit the virus, the primaSEXXXXX-VNry treatment is still symptomatic, managing the disease through supportive care, isolation, and experimental measures.