(Reuters) - Millions of children's lives and billions of dollars could be saved if vaccines were more widely available in 72 of the world's poorest countries, according to a series of studies published on Thursday.

In studies in the Health Affairs and The Lancet journals, public health experts and scientists projected that if 90 percent of children in those countries were immunized, more than $151 billion in treatment costs and lost productivity could be saved in 10 years, giving economic benefits of $231 billion.