The United States remains the country most affected, with an estimated 3.80,000 dead.

The United States said on Tuesday that all air travelers entering the country will need a negative COVID-19 test before departure, as concerns grow over more contagious variants of the coronavirus. The policy goes into effect on January 26 and extends an existing measure targeting Britain, where the strain known as B117 has been linked to a drastic increase in cases.

Ireland, which now has the highest infection rate in the world, also announced on Tuesday it was expanding to all arrival screening measures that previously only applied to travelers from the UK and South Africa.

The United States remains the country most affected, with an estimated 3.80,000 dead.

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