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A child who has rotavirus once will have antibodies that offer protection against future infections.

For example, the first rotavirus vaccine was withdrawn in 1999 when researchers detected an increased risk of intussusception, a rare type of bowel obstruction, for children who received the vaccine.

The rotavirus vaccine, for example, is an unmitigated success, but it can lead to intussusception — a life-threatening condition in which the intestine folds in on itself — in about 0.02 percent of children who are vaccinated.

"Robert F Kennedy Junior called me and he said that he needed my help," says the scientist, whose vaccine against rotavirus is estimated to save some two thousand lives a day in the developing world.

These include doses against the deadly rotavirus infection in children, the agency said in emailed comments.