"Importantly, the shingles vaccine shared a key ingredient with the TB shot, a component that enhanced the effectiveness of both but was in limited supply.<p>From a business standpoint, GSK’s decision made sense."<p>So they stopped developing a vaccination destined to save the poor from dying and instead prioritised a vaccine to help rich people feel better. As horrible or amoral as that sounds, it's kind of exactly what people are hoping for when yet buy stocks and want the line to go up.