Travel CDC issues travel health warning for Mexico, 11 other countries amid ‘very high’ COVID risk February 1, 2022February 2, 2022Bailey Schulz, USA TODAYComments Off on CDC issues travel health warning for Mexico, 11 other countries amid ‘very high’ COVID risk Larger countries are considered to have a "very high" risk for COVID-19 when they report more than 500 cases of new COVID-19 cases per 100,000 people.