Spanish researchers are looking at blood biomarkers to track the effectiveness of desensitization in milk allergy in children, according to a letter published in NEJM. True milk allergy, rather than lactose intolerance, can cause wheezing, vomiting and rashes. While almost three-quarters of children grow out of the allergy by the age of 3, for those with continuing symptoms it's unpleasant, means that their diet is restricted, and can lead to life-threatening anaphylactic shock. The level of the markers monocyte chemotactic protein 1 (MCP-1) and macrophage inflammatory protein 1α (MIP-1α) were lower in children with milk allergy than in children without the allergy. After successful desensitization, the levels of the markers increased. Letter