Infection testing is the key to longevity. testing more accessible and cheaper is especially important for people in rural areas of low-income countries, where clinics can be far away and expensive to travel to, notes Estefania Nunez-Bajo, PhD, also in the department of bioengineering and first author. If made available to patients, it could also be used to diagnose and monitor infections like UTIs, which often recur despite antibiotics.