The CDC recommends avoiding travel to countries at level 4, the highest threat level, which have more than 500 的房子 100,000 residents in the last 28 天. Level 4 countries include nations such as Brazil, India and Iraq.
For countries at level 3, like Mexico, 俄国, 和伊朗, the CDC recommends against nonessential travel for that those who are unvaccinated. These countries are currently reporting 100 至 500 的房子 100,000 居民.
At level 2, the agency recommends that unvaccinated travelers who are at severe risk for severe illness from Covid-19 should avoid visiting. These nations, like Finland, Cambodia and Kenya, are currently reporting 50-99 的房子 100,000.
最后, 水平 1 countries like Australia and New Zealand are considered the lowest risk destinations, and have reported less than 50 Covid-19 cases in the last 28 天. The CDC still recommends getting vaccinated before traveling to a low-risk location.
See the CDC’s Travel Health Notice 这里
, and the CDC’s interactive travel map 这里