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Global Grand Challenges: Multiplex Platforms to Assess Indicators of Micronutrient Status, Inflammation and Infectious Disease

Gates (Bill & Melinda) Foundation

Although combined immunological measurement of several micronutrient biomarkers has been demonstrated, current methods still have important limitations. These include heterogeneity in the composition of standards and controls; inconsistent batch-to-batch performance of analyte-binding molecules; variable reactivity for some analytes, especially soluble transferrin receptor (sTfR); and a functional analytical range that is too narrow to cover the physiological values of some analytes, such as CRP. It would also be valuable to add bioindicators for vitamins B1, B2, B9 and B12, which may require binding molecules that recognize metabolites or proteins associated with deficiency, a specific vitamer (plasma methyl-tetrahydrofolate without reacting with folic acid), comparable reactivity across vitamers (several folate forms in red blood cells), or a specific carrier-protein form (holo-transcobalamin rather than apo-transcobalamin or haptocorrin for vitamin B12).

The improved assays must combine high analytical specificity, sensitivity and robustness with a functional analytical range matched to the physiological values expected in the target populations (women of reproductive age, including during pregnancy and lactation, preschool-age children and older adults). Assays must remain low-cost (no more than US$20 for all analytes measured in duplicate) and require very small sample volumes, preferably less than 10 µL of plasma or serum). The tests are intended for population surveillance rather than local clinical (point-of-care) use. They should be designed to run many samples in a single batch in a small number of national or regional reference laboratories. The goal is to reduce dependence on expensive, infrequent population surveys and on export of samples to specialized laboratories in high-income settings.

This challenge is structured around two alternatives, a minimum-scope approach and an optimistic-scope approach. Targets are aligned with the candidate Target Product Profile for this platform, and applicants will be held to the relevant performance, cost and instrument targets.

Deadline: Sep 08, 2026

Specialties

International Opportunities

Medical - Basic Science

Medical - Translational

Medical

Medical - Clinical Science

Social Sciences

Eligibility Requirements

This initiative is open to nonprofit organizations, for-profit companies, international organizations, government agencies and academic institutions. We particularly encourage applications led by women or in collaboration with women-led organizations, and applications from or in collaboration with institutions based in low- and middle-income countries. Only applicants applying through a legally recognized corporate entity are eligible. Because no single institution is likely to hold all the necessary expertise, collaboration among groups working in human metabolism, biomolecule characterization and immunology is strongly encouraged.

Sponsor Details

Sponsor Institute/Organizations: Gates (Bill & Melinda) Foundation

Sponsor Type:

Address: 2099 Pennsylvania Ave, NW Suite 200 Washington DC 20006 USA

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