The authors tested the vitamin A level in 20 children with measles in California, and to their surprise, half of them had a low level of vitamin A (less than 0.7), despite the fact that everyone was well fed. In the control group of uninfected children, all had normal levels of vitamin A. In the second control group (patients with other infectious diseases), 30% had a low level of vitamin A. All patients had measles and a low level of retinol-binding protein and prealbumin. assume to have well-nourished American children, the level of vitamin A during measles is not lowered. They also suggest that the level of vitamin A drops and other infectious diseases.