Malaria rapid diagnostic tests: performance, pitfalls, and progress

Area of Science:

• * Infectious Diseases
• * Tropical Medicine
• * Diagnostics

Background:

• * Malaria rapid diagnostic tests (RDTs) have transformed diagnosis in endemic areas.
• * Current RDTs, primarily HRP2-based, show reduced sensitivity at low parasite densities (<200 parasites/μl).
• * HRP2/3 gene deletions and antigenemia pose significant threats to HRP2-based RDT accuracy.

Purpose of the Study:

• * To review the current performance of malaria RDTs.
• * To identify threats impacting RDT validity.
• * To explore innovations enhancing RDT performance and utility.

Main Methods:

• * Comprehensive literature review of malaria RDT performance.
• * Analysis of factors affecting RDT sensitivity and specificity.
• * Evaluation of emerging diagnostic technologies and RDT innovations.

Main Results:

• * Most WHO-prequalified RDTs perform well, though some exceptions exist.
• * RDT sensitivity correlates with malaria transmission intensity; lower transmission yields more false negatives.
• * Lactate dehydrogenase (pLDH)-based RDTs demonstrate good performance for P. falciparum (in hrp2/3 deletion areas) and P. vivax.
• * Point-of-care alternatives show promise but need further validation.

Conclusions:

• * RDTs remain essential for clinical malaria diagnosis.
• * Newer pLDH-based RDTs are effective in regions with HRP2/3 gene deletions.
• * Continued innovation is vital for maintaining RDT efficacy in malaria control efforts.