How 5 top drugmakers are racing to develop cures and vaccines for the coronavirus that has killed more than 400 people and infected over 20,000

· As the coronavirus outbreak has exploded into a global public health emergency, leading drugmakers have begun researching treatments and vaccines to stop the virus. 
· In recent days, Johnson & Johnson, Regeneron Pharmaceuticals, GlaxoSmithKline, Gilead Sciences and Moderna have all announced efforts to combat the...