New magnetic-particle test detects amoxicillin allergy with 98% sensitivity

A new blood testing platform could make it easier to identify people who are genuinely allergic to amoxicillin, one of the most widely used penicillin antibiotics. Researchers tested 30 nanometre magnetic particles on blood samples from 94 people, including 50 patients with confirmed amoxicillin allergy and 44 who tolerated the drug. The experimental system detected allergic patients with 98 percent sensitivity, while the commonly used ImmunoCAP commercial test detected only about 17 percent in the same comparison. As reported by Phys.org, the technology uses tiny iron oxide particles coated with silica and molecular structures designed to capture allergy-related antibodies. The early results are promising, but the test still needs larger clinical studies and regulatory validation before it can replace existing diagnostic methods or influence routine prescribing.Why amoxicillin allergy is hard to diagnoseIf patients develop a rash, swelling, breathing problems or other symptoms after taking amoxicillin, their doctors may record a penicillin allergy in their medical history. That label can remain for years, even when the original reaction was caused by an infection, another medicine...