COVID-19 is a contagious disease 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, breathing 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 develop noticeable symptoms.[11][12] Of those 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 symptoms (respiratory failure, shock, or multiorgan dysfunction).[13] Older 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) 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 breathed 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 indoors. Transmission 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 virus’s nucleic acid include real-time reverse transcription polymerase chain reaction (RT‑PCR),[17][18] transcription-mediated 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 distributed in various countries, many of which have 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, hand washing, and keeping unwashed hands away from the face. While drugs have been developed to inhibit the virus, the primary treatment is still symptomatic, managing the disease through supportive care, isolation, and experimental measures.
记者今天（3日）从中国铁路集团公司获悉，中国铁路预计发送旅客1855万人次，计划新增旅客列车923列。昨天（2日），全国铁路发送旅客1978.1万人次，交通安全稳定有序。
我们重申东京审判的历史价值和深刻影响，维护日本侵略罪的法律特征，对于维护战后国际秩序、维护人类正义具有重要现实意义。
中新网北京5月3日电(记者)“天越来越暖了，白昼越来越长，春天很美……”5月1日晚，国家京剧院新创作的京剧诗词《春秋》在北京梅兰芳大剧院首演。该剧以二十四节气为背景，融合古典诗词、京剧歌曲、民族管弦乐，打造“新国风”的审美表达。
中国新闻绍兴5月3日电（先京）“生命并不长，而是转瞬即逝。我希望通过解读古代士大夫的形象，向观众传递圣贤的精神真挚。”民盟委员、中国戏剧梅花奖获得者、绍兴市柯桥区小梅花月戏剧艺术中心副主任张林近日接受《中国新闻》专访时表示。中国新闻网.机构。
（央视财经《第一时间》）如果没有火车票，很多人都会利用排队功能来买票。那么如何提高候补门票兑换的成功率呢？听听铁路12306怎么说。
5月3日，游客在旅游摄影店化妆。五一假期期间，福建省晋江市武林古村凸显南阳华人独特的村落风情，“娘惹”服饰的独特体验深受游客好评。不少市民和游客身着精致绚丽的传统娘惹服饰，漫步在百年华侨老屋林立的大街小巷，享受着闽南侨韵与南洋风情的融合碰撞。中国报业王东明供图。
《2025年香港烟草管制（修订）法条例》将于4月30日生效，禁止在公共场所持有某些替代吸烟产品，例如电子烟烟弹和加热烟草产品。普通烟草制品不受影响。
“十五五”规划纲要强调要“实施工业基础设施改造工程”和“实施重大技术装备攻关工程”，并明确“大型客船、大型液化天然气运输船等的研发、设计和制造”。 “大型液化天然气船的重要性不难理解，那么为什么规划纲要中会包含‘大型邮轮’呢？” ”，很多人可能会问。
中新社柏林5月2日电 德国中国工商会1日就欧盟委员会根据《外国补贴条例》(FSR)将中国企业排除在外一事发表声明。