A: It goes back to the roots of how the Foundation came into being: Bill and Melinda Gates read about the rotavirus vaccine that their children had access to.

The vaccine is derived from the most commonly circulating strain of rotavirus, and also offered good protection against some other strains across the two-year period.

Researching the feature of capsid protein gene form porcine rotavirus JL94 strain in China is to lay a foundation for developing concentrated antivirotic vaccine.