Scientists find that parenting a child can reduce the variations behind immune systems.
California has been hit hard by norovirus this fall and winter.
Officials report 32 norovirus outbreaks in California since October 2015.
India announced that its new rotavirus vaccine proved to be effective in a phase III clinical trial.
Britain's Queen Elizabeth II is currently still fighting the stomach flu at King Edward VII's hospital. She is be released in the next few days.