Measles is a highly contagious childhood disease. During the prevaccine era, nearly every child acquired measles before the age of 15 years. A key characteristic of the disease is a transient immune suppression, causing increased susceptibility to opportunistic infections.

Educational policies may increase or decrease health differences, depending on whether they reinforce or counteract gene-related differences. We investigate whether one such policy affected health differently for people with different genetic backgrounds. We find that the additional education generated by the policy benefited those with higher genetic risk of obesity the most, reducing the gap in unhealthy body size between those in the top and bottom terciles of genetic risk of obesity from 20 to 6 percentage points.