Asthma and allergic rhinitis can cause similar systems. However, the different conditions require different treatments, so it’s important to distinguish between them. Until now, diagnosing asthma has been difficult. Therefore, doctors have frequently underdiagnosed it in some situations and overdiagnosed it in others. To make diagnosis easier and more accurate, Erick Sackmann of the University of Wisconsin and his colleagues invented a handheld device that measures how fast neutrophils in a drop of blood move across a chemotactic gradient. They found the neutrophils of asthmatics move more slowly than the neutrophils of non-asthmatics. The research appears in the Proceedings of the National Academy of Sciences.
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