Sample-ready multiplex qPCR assay for detection of malaria

Area of Science:

• Molecular diagnostics
• Parasitology
• Biotechnology

Background:

• Current malaria diagnostics like microscopy and rapid tests have limitations.
• Real-time PCR (qPCR) offers higher sensitivity but faces challenges like standardization and cold-chain requirements.
• Lyophilization of molecular assays can address these limitations, enabling broader qPCR adoption.

Purpose of the Study:

• To evaluate the performance and stability of a lyophilized multiplex malaria qPCR assay (MMSR).
• To compare the MMSR assay with its non-lyophilized (wet) counterpart.
• To assess the potential of lyophilized assays for improving malaria diagnostics.

Main Methods:

• A multiplex malaria qPCR assay was lyophilized into a Sample-Ready™ format (MMSR).
• MMSR assay performance was compared to the 'wet' assay using Plasmodium falciparum and Plasciparum vivax DNA.
• Stability studies were conducted at various temperatures (4°C, RT, 37°C, 42°C) over 42 days.

Main Results:

• The MMSR assay demonstrated a lower limit of detection (0.244 parasites/μL) compared to the 'wet' assay.
• MMSR assay showed high efficiency, stability at 37°C for 42 days, and an estimated shelf-life of 5 months.
• Field clinical samples analyzed with MMSR assay showed 100% sensitivity and specificity.

Conclusions:

• The lyophilized malaria qPCR assay (MMSR) exhibits robust performance and high stability, comparable to the 'wet' assay.
• MMSR assay offers flexibility and a viable option for malaria diagnostics, catering to diverse needs and budgets.
• Lyophilization presents a promising approach for enhancing the accessibility and utility of molecular malaria diagnostics.