Medical Xpress (Douglas, Isle of Man, April 17) -- One of the most popular vaccine brands for children may not be the most cost-effective choice. And doctors may be overlooking some cost factors when choosing vaccines, driving the market toward what is actually a more expensive option, according to a new study co-authored by Sheldon H. Jacobson, a professor of computer science and of mathematics at Illinois. Also: Science Daily (Chevy Chase, Md., April 17), ScienceBlog (April 21), News-Medical.net (Sydney, April 22).