DS probably had measles last month - the swab the GP took could only confirm he was immune, and as he had first MMR then he could be immune due to that. A month on, he starts on D & V, and has had it for a week. Am arranging for a stool sample to be sent off. If DS had any gut problems due to measles, would it 1)include vomiting and 2)start a month after the measles? I am hoping that it's a case of his immunity being low so him picking up a tummy bug rather than that any damage was done by the measles....Because he was barely unwell at all with the measles, I didn't bother giving vitamins/cod liver oil/ probiotics. Would there be any point doing so now?