Recurrent viral infections are common between 6 month to 4 year of age .. They are of many types like vomittings,loose motions ,fever , rash..
Even dengue fever is viral fever.Swine flu , bird flu all are viral infections.
One viral infection sometimes lower your immunity and make you vulnerable for more viral infections in next couple of months.
Parents often struggle from one doctor to another to get rid of these recurrences..
There is no research required to understand it but we should learn prevention .