The CDC recommends against nonessential travel to Level 3 countries for those who are unvaccinated and all travel to level 4 countries.
Neither the CDC nor the State Department alerts prevent US citizens from visiting Costa Rica.
"As conditions evolve, we regularly update our advice to USA travelers", the official said.
Many more states are categorized under the heading "Exercise increased caution".
Even if the State Department follows with its own reduced risk alerts for most of these countries, the travel restrictions barring foreign nationals who were physically present in China, Iran, the European Schengen Area, the UK, Ireland, Brazil, South Africa, and India in the 14-day period before returning to the United States continue to remain in effect. "So we are actively engaging with them to determine the timeframe".
The overnight curfew will now start later - at 11:00 pm instead of 9:00 pm - before being dropped entirely, if all goes to plan, on 30 June.
The United States also said Tuesday it will hold talks with Canada, Mexico, the European Union and Britain on how to restart global travel.
But most passengers from the United Kingdom are still banned from travelling to the US.
While travel to South Africa is still not recommended due to the Covid-19 pandemic and restrictions, USA travellers who are fully vaccinated using a recognised vaccine do not have to get tested before leaving the United States, unless their destination country requires it.
Airlines and some nations have complained that current travel restrictions to the US are out of step with rising vaccination rates and the reduced threat of contracting COVID-19, and many limits on USA travelers remain in place.
The US Centers for Disease Control and Prevention (CDC) has recommended eased travel recommendations for more than 110 countries and territories - including South Africa. This restriction also remains in effect for fully vaccinated passengers.
Complicating any efforts to ease worldwide travel, the United States does not centralize its vaccination records and has significant segments of the population suspicious of "vaccine passports".
European nations have put forward a hodgepodge of rules as they strike a balance between public health and reviving tourism economies that were devastated a year ago. Countries ranked lowest for COVID-19 risks now include Singapore, Israel, South Korea, Iceland, Belize and Albania.
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