National –
The United States' Center for Disease Control and Prevention (CDC) has added Thailand to its highest-risk Level 4 category for travel on Monday, March 7th, along with Hong Kong and New Zealand.
The destinations were classified as "Level 4: Covid-19 Very High" risk when more than 500 cases per 100,000 people over 28 days were recorded, according to the CDC considerations.
This means that it is recommended for all travelers from the US to avoid traveling to Thailand. If they must travel to the country, they are highly advised to be fully vaccinated and up to date with their COVID-19 vaccines before travel.
Travelers are also recommended to follow all requirements and recommendations while they are in Thailand, especially its "Test&Go" program that allowed vaccinated arrivals to enter the Kingdom without mandatory quarantine.
Currently, there are about 135 countries/destinations at Level 4, including Canada, the United Kingdom, Germany, the Netherlands, Japan, South Korea, and Singapore. The US does not classify themselves, notes TPN, but if they did they would also be considered as Level 4 under the current guidelines.