四级旅行警告：鉴于中国武汉首次发现新型冠状病毒，出行时勿前往中国湖北省：
中国武汉首次发现由新型冠状病毒导致的肺炎，目前疫情正在继续。为了遏制这种新型冠状病毒，中国当局已经暂停武汉周边地区的空中和铁路交通。2020年1月23日，美国国务院令所有从事非紧急工作的美方人员及其家属撤离。美国政府仅有很有限的能力为在湖北省的美国公民提供紧急服务。
中国当局已宣布对武汉周边地区的旅行实施严格限制。出行人员应该知晓，中国政府可阻止他们进入或离开湖北省的某些地区。旅行限制可以在很少事先通知或没有事先通知的情况下生效，出行人员应该做好准备。
鉴于目前出现的由某新型冠状病毒导致的呼吸系统疾病可人际传播，美国疾病控制与预防中心（U.S. Centers for Disease Control and Prevention）已发布三级旅行警告（避免非必要的旅行）。
你如果必须前往武汉，应该：
避免与患者接触。
避免接触动物（活物或死物）、动物市场和动物制品（例如未烹饪的肉类）。
经常用肥皂和水洗手，每次至少20秒。如果手头没有肥皂和水，可使用含酒精的洗手液。
有基础健康问题的老年人和旅行人员有可能出现更严重的疾患，应该与健康护理人员讨论前往武汉的问题。
你如果在过去14天内曾前往武汉并有发热、咳嗽或呼吸困难等不适，应该：
立即就医。在前往医生诊所或急诊室之前事先打电话，告知你最近旅行的情况和你的症状。
避免与其他人接触。
不带病旅行。
咳嗽或打喷嚏时用纸巾或袖子（不能用手）捂住口鼻。
经常用肥皂和水洗手，每次至少20秒。如果手头没有肥皂和水，可使用含酒精的洗手液。
如需了解最新的详情，请查阅https://wwwnc.cdc.gov/travel/notices/watch/novel-coronavirus-china and https://www.cdc.gov/coronavirus/novel-coronavirus-2019.html https://china.usembassy-china.org.cn/health-alert-012420/ https://www.cdc.gov/coronavirus/novel-coronavirus-2019.html

Level 4: Do not travel to Hubei province, China due to novel coronavirus first identified in Wuhan, China:
There is an ongoing outbreak of respiratory illness first identified in Wuhan, China, caused by a novel (new) coronavirus. In an effort to contain the novel coronavirus, the Chinese authorities have suspended air and rail travel in the area around Wuhan. On January 23, 2020, the Department of State ordered the departure of all non-emergency U.S. personnel and their family members. The U.S. government has limited ability to provide emergency services to U.S. citizens in Hubei province.
Chinese authorities have imposed strict travel restrictions in the area around Wuhan. Travelers should be aware that the Chinese government could prevent them from entering or exiting parts of Hubei province. Travelers should be prepared for travel restrictions to be put into effect with little or no advance notice.
U.S. Centers for Disease Control and Prevention has issued a Warning Level 3 Alert (Avoid Nonessential Travel) due to an ongoing outbreak of respiratory illness caused by a novel (new) coronavirus that can be spread from person to person.
If you must travel to China, you should:
If you traveled to China in the last 14 days and feel sick with fever, cough, or difficulty breathing, you should:
Please see https://wwwnc.cdc.gov/travel/notices/watch/novel-coronavirus-china and https://www.cdc.gov/coronavirus/novel-coronavirus-2019.html for further updates.
Continue to exercise increased caution in China due to arbitrary enforcement of local laws and special restrictions on dual U.S.-Chinese citizens:
The Chinese government has asserted broad authority to prohibit U.S. citizens from leaving China by using “exit bans,” sometimes keeping U.S. citizens in China for years. The Chinese government uses exit bans coercively:
In most cases, U.S. citizens only become aware of the exit ban when they attempt to depart China, and there is no method to find out how long the ban may continue. U.S. citizens under exit bans have been harassed and threatened.
U.S. citizens may be detained without access to U.S. consular services or information about their alleged crime. U.S. citizens may be subjected to prolonged interrogations and extended detention for reasons related to “state security.” Security personnel may detain and/or deport U.S. citizens for sending private electronic messages critical of the Chinese government.
Extra security measures, such as security checks and increased levels of police presence, are common in the Xinjiang Uighur and Tibet Autonomous Regions. Authorities may impose curfews and travel restrictions on short notice.
The Chinese government does not recognize dual nationality. U.S.-Chinese citizens and U.S. citizens of Chinese heritage may be subject to additional scrutiny and harassment, and the Chinese government may prevent the U.S. Embassy from providing consular services. Read the Safety and Security section on the country information page.
If you decide to travel to China: