WASHINGTON - American and Georgetown universities joined a growing list of universities this week in requiring students who return in the fall to get a coronavirus vaccine.

BEIJING - One nation after another is closing its doors to most Chinese travelers as the death toll from the novel coronavirus continues to rise with no sign that the virus can be contained before it becomes a full-blown planetary health crisis. China's increasing isolation threatens to turn this new epidemic into a geopolitical conflict, intensifying pre-existing tensions between China and the United States and having potentially significant impacts on the global economy.