
Twists and turns on the road to a Covid vaccine
Childhood used to be far more deadly than it is today. A little over a century ago, the infant mortality rate in the United States stood at a staggering 20 percent, and the mortality rate for children aged five and under was also at 20 percent, as compared to the current U.S. infant mortality which stands at 0.57 percent. Among the leading causes of death in children at the time were measles, diphtheria, smallpox and polio. However, these diseases now feel as if they belong exclusively to the pa