Scientists just got a step closer to creating a universal allergy treatment - ScienceAlertThey developed dissolvable nanoparticles out of an FDA-approved polymer, and then filled them with egg protein, before injecting them into mice that were allergic to eggs. Usually, these mice would develop an asthma-like response, but because the egg protein was safely stored inside the friend-looking nanoparticles, their bodies didn't react. Even better, the nanoparticles were then cleaned up by macrophages, which are tasked with 'vacuuming up' any debris in the blood stream. And these macrophages are part of the innate immune system, which meant that the allergens were then processed as normal. "The vacuum-cleaner cell presents the allergen or antigen to the immune system in a way that says, 'No worries, this belongs here,'" said Miller. The immune system then shuts down its attack on that allergen, and gets reset to normal.