The US Has 3 Covid Vaccines—Testing New Ones Is Complicated
Now that authorized versions are available, it’s tough to recruit volunteers for trials that might give them a placebo. But there are other options.
Now that authorized versions are available, it’s tough to recruit volunteers for trials that might give them a placebo. But there are other options.
Tests for many experimental drugs are now on hold, but for patients with life-threatening diseases, that means putting hope on hold too.