BEIJING, March 2: China and the United States should remove all barriers to travel between the two countries if the United States achieves herd immunity for COVID-19 with 90% of its population vaccinated, potentially by August, a Chinese epidemiologist has said.

April 25: New York Governor Andrew Cuomo on Friday pointed to research showing that strains of the novel coronavirus entered his state from Europe, not China, and said that travel bans enacted by U.S. President Donald Trump were too late to halt its spread.