Off-grid field-deployable molecular diagnostic platform for malaria surveillance.

Area of Science:

• Tropical Medicine
• Molecular Diagnostics
• Vector Surveillance

Background:

• Malaria remains a significant global health challenge, particularly in tropical regions.
• Traditional diagnostic methods (microscopy, qPCR) require specialized labs and personnel, limiting field applicability.
• There is a need for portable, cost-effective diagnostic tools for on-site malaria detection.

Purpose of the Study:

• To develop and validate a portable, field-deployable real-time quantitative polymerase chain reaction (qPCR) platform for detecting Plasmodium species.
• To assess the platform's sensitivity, specificity, and performance in resource-limited field conditions.
• To enable real-time malaria surveillance and facilitate timely public health interventions.

Main Methods:

• DNA isolation using DNAzol followed by TaqMan probe-based qPCR on the bCUBE platform.
• Detection of five Plasmodium species: P. falciparum, P. vivax, P. malariae, P. ovale, and P. knowlesi.
• Validation using in vitro-cultured P. falciparum, experimentally infected Anopheles gambiae, and field-collected mosquitoes in Cameroon.

Main Results:

• The bCUBE qPCR platform showed excellent correlation (R² = 0.993) with standard laboratory qPCR.
• High sensitivity achieved: detection of 0.5 parasites/µl blood, 1 oocyst, and 5-10 sporozoites.
• Accurate species identification and successful field deployment in Cameroon, providing same-day results for P. falciparum in mosquitoes.

Conclusions:

• The bCUBE qPCR system provides a portable, sensitive, and scalable solution for malaria diagnostics.
• Enables real-time, on-site surveillance in resource-limited settings, reducing reliance on centralized laboratories.
• Facilitates rapid decision-making for effective malaria control programs.