Statement of Purpose: Vaccines have been shown to be exceptionally safe and effective, yet each year 1.5 million people die due to vaccine-preventable infectious disease . Challenges in terrain and availability of adequate tools in resource constrained settings often limit the effective distribution of vaccines, which can lead to reduced vaccine coverage rates . One key barrier to improving vaccine coverage rates in low-resource settings is the lack of accurate immunization records. Because centralized databases of medical records do not exist in these areas, healthcare workers often rely on verbal communication with parents to determine vaccination status, which is often inaccurate leading to missed opportunities to vaccinate and wasted resources when additional unnecessary doses of vaccine are administered. To address this issue, we have developed an on-patient medical record using long-lived fluorescent microparticles, microneedles, and an adapted smartphone to determine vaccination status in the developing world. Our platform is designed to deliver both the vaccine and fluorescent particles in one form factor to streamline the administration process and be detectable for up to five years using a minimally-adapted smartphone.