A bedside dipstick method to detect Plasmodium falciparum
1Department of Pediatrics, Seth G.S. Medical College and KEM Hospital, Parel, Mumbai-400012, India. irashah86@hotmail.com
Insights
The Parasight-F dipstick test effectively diagnoses Plasmodium falciparum malaria in children, showing 83.3% sensitivity. However, its accuracy decreases significantly in mixed infections and in infants under six months.
Area of Science:
- Medical diagnostics
- Parasitology
- Pediatric infectious diseases
Background:
- Accurate diagnosis of Plasmodium falciparum malaria is crucial for effective treatment, especially in children.
- Rapid diagnostic tests (RDTs) offer a promising alternative to microscopy, but their performance varies.
- The HRP-II antigen detection method is a common basis for RDTs.
Purpose of the Study:
- To evaluate the diagnostic efficacy of the Parasight-F dipstick test for Plasmodium falciparum in pediatric patients.
- To determine the sensitivity and limitations of Parasight-F in a pediatric population.
Main Methods:
- A study involving 30 children (2 months to 12 years) with confirmed Plasmodium falciparum on peripheral smear.
- Parasight-F testing performed on EDTA or finger-prick blood samples.
- Analysis of sensitivity based on infection type (mono vs. mixed) and patient age.
Main Results:
- Parasight-F demonstrated an overall sensitivity of 83.3% for Plasmodium falciparum detection.
- Sensitivity dropped to 25% in cases of mixed Plasmodium vivax and falciparum infections.
- All infants under 6 months tested negative with Parasight-F.
- Parasitic index, prior antimalarial treatment, and malaria severity did not impact test sensitivity.
Conclusions:
- Parasight-F is a valuable tool for diagnosing Plasmodium falciparum malaria in children.
- Clinicians should be aware of the reduced sensitivity in mixed infections and in very young children.
- Further research may be needed to improve RDT performance in specific pediatric subgroups.
Abstract:
We conducted this study to determine efficacy of Parasight-F (an HRP-II antigen dipstick method to detect P. Falciparum) in children. A total of 30 children were enrolled in the age group of 2 months to 12 years whose peripheral smear showed asexual forms of Plasmodium falciparum. All patients were tested for presence of HRP-II antigen of Plasmodium falciparum in their blood by the Parasight-F dipstick test by either an EDTA sample or a finger prick blood sample. The sensitivity of Parasight-F was 83.3 % However, the sensitivity of Parasight-F to detect Plasmodium Falciparum in case of mixed Plasmodium (Vivax + Falciparum) infection was only 25 %. Also, all patients less than 6 months of age had a negative Parasight-F test. Parasitic index, prior treatment with antimalarials or severity of Falciparum malaria have no effect on the sensitivity of Parasight-F test. We conclude that Parasight-F is an effective tool for diagnosis of Plasmoduim falciparum malaria in children.
