Track: Build With Gemma 4 · Variant used: gemma4:e2b (default) and gemma4:e4b (compared) · Submission: individual Not a medical device. This is a research proof-of-concept and does not replace clinical evaluation or laboratory confirmation. The scenario that motivated this A community health worker is 80 km from the nearest health center. A child has a fever. The visit kit is a stack of single-T lateral-flow rapid diagnostic tests — COVID-19 antigen, HIV TR1, syphilis DPP, dengue NS1, hepatitis B/C, leishmaniasis rK39, and pregnancy hCG. In Brazil, these are public-health-system mandated tests, available in every primary care unit (UBS). Misreading them is consequential: a false-positive HIV result is a life-altering moment for the patient, and a false-negative dengue NS1 in the first week of infection misses the only window where the antigen test works at all. There is no mobile signal. Cloud-based "AI triage" tools do not run here.…