COVID-19 is a contagious disease caused by the coronavirus SARS-CoV-2. In January 2020, the disejin88bet.onease spread worldwide, resulting in the COVID-19 pandemic.
The symptoms of COVID‑19 can vary but oftak168app.babyen include fever,[7] fatigue, cough, breathing difficulties, loss of smell, and loss of taste.[8][9][10] Symptoms may begin one to fourak168app.clubteen days after exposure to the virus. At least a third of people who are infected do not develop noticeable symptoms.[11][12] Of those who develop ks168app.sitesymptoms 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 imagiic88ng), and 5% develop critical symptoms (respiratory failure, shock, or multiorgan dysfunction).[13] Oic88lder people have a higher risk of developing severe symptoms. Some complications result in death. Some people continue to experience a range of effects (long COVID) foic88r 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 ic88breathed in or come into contact with the eyes, nose, or mouth. The risk is highest when people are in close proximity, but small airborne particles containing the virus can remain suspended in the air and travel over longer distances, particularly ilr88ndoors. Transmission can also occur when people touch their eyes, nose, or mouth after touchinglr88 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]
Telr88sting methods for COVID-19 to detect the virus’s nucleic acid include real-time reverse transcription polymerase chain reaction (RT‑PCR),[17][18] transcription-medilr88ated amplification,[17][18][19] and reverse transcription loop-mediated isothermal amplification (RT‑LAMP)[17]op88[18] from a nasopharyngeal swab.[20]
Several COVID-19 vaccines have been approved and distributed in various countries, many of which hsi88ave initiated mass vaccination campaigns. Other preventive measures include physical or social distancing, quarantining, ventilation of indoor spaces, use of face masks or coverings in public, covering coughs and sneezes, 88vhand washing, and keeping unwashed hands away from the face. While drugs have been developed to inhibit the virus, the primary treatment is still symptomatic, mSEXXXXX-VNanaging the disease through supportive care, isolation, and experimental measures.