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Go to Economist.com and get your first month free. Welcome to our viewers in the United States and around the world, Wolflitzer is off today.

I'm Pamela Brown in the situation room and we are following key

new developments in the coronavirus crisis including results from the US trial

of the AstraZeneca vaccine which shows shows it is 79% effective against symptomatic COVID.

The trial also found no increased risk of blood clots after concerns prompted some European

countries to temporarily halt administering that

vaccine. Meanwhile the head of the CDC is warning that virus variants could

spark what she calls another avoidable surge.

Fear of increased infections

has prompted Miami Beach to extend an emergency curfew

as spring break crowds throng the city.

And we're also following the situation along the southern border. The

White House again declining to call it a crisis even as the number of children

being held in overcrowded facilities nearest almost 5,000.

...