It was called the "most dreadful scourge of the human species." It killed at least one-third of the people it infected. It decimated entire populations, striking old and young, rich and poor alike.
9 hours ago
According to the Centers for Disease Control and Prevention, vaccines have saved more the 732,000 lives in the past two decades and studies have repeatedly shown that they are the best way to protect our ...
May 06, 2015