the estimated risk of cancer to people who were children and adults during the fukushima accident, in the most affected area, was determined to be lower again when compared to the most at risk group - infants. a thyroid ultrasound screening programme is currently[2013] ongoing in the entire fukushima prefecture, this screening programme is, due to the screening effect, likely to lead to an increase in the incidence of thyroid disease due to early detection of non-symptomatic disease cases.