The United States said Tuesday it will distribute hundreds of millions of free Covid tests in the face of surging Omicron cases, which have forced governments worldwide to reimpose restrictions ahead of the holidays, reports AFP.

Washington also said Tuesday it will donate more than $500 million in international Covid aid to help countries battle the pandemic, while Israel announced tough new restriction on US travel.

Omicron, now present in dozens of countries, appears to be more infectious, despite early indications that it does not cause a more severe form of Covid-19 than the Delta strain.

Its lightning dash around the globe has forced governments to reimpose restrictions ahead of the holidays, dampening hopes the worst of the pandemic is over.

US President Joe Biden was due to address the nation later Tuesday after a White House official said the government will distribute 500 million free Covid tests and mobilize military medical personnel if needed.

The United States will also give $580 million (654 million euros) in additional aid to international organizations to fight Covid in the face of surging Omicron cases, Secretary of State Antony Blinken said.

The announcements come after the Centers for Disease Control and Prevention said Omicron now accounts for 73.2 percent of new US cases over the past week ending Saturday.