How come there’s no vaccine for the stomach flu?

We have vaccines for the flu, swine flu and many other illnesses or diseases but how come there’s none for the rotavirus or stomach flu. It’s probably one of the most common sicknesses and many people get it every year/ it spreads so easily. If it’s something so common and affects so many people every year how come... show more We have vaccines for the flu, swine flu and many other illnesses or diseases but how come there’s none for the rotavirus or stomach flu. It’s probably one of the most common sicknesses and many people get it every year/ it spreads so easily. If it’s something so common and affects so many people every year how come scientists haven’t made a cure or vaccine for those kind of viruses?
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