# Prevalence of molecular markers associated with Plasmodium falciparum resistance to chloroquine and sulphadoxine/pyrimethamine in three malaria endemic local areas of Benue State, Nigeria

## TL;DR

This study examines drug resistance markers in malaria parasites from three areas in Nigeria to assess the spread of resistance to common antimalarial drugs.

## Contribution

The study provides new data on the prevalence of specific molecular markers of drug resistance in Plasmodium falciparum in Benue State, Nigeria.

## Key findings

- High prevalence of resistance markers to chloroquine and antifolate drugs was observed in P. falciparum isolates.
- Resistance markers N86Y, K76T, S108N, N51I, and A437G were detected in 41-60% of isolates.
- The findings suggest a need for strategies to reduce multiple-strain infections and improve drug efficacy.

## Abstract

currently, malaria (primarily caused by Plasmodium falciparum) remains prevalent in over 106 countries and is one of the most severe public health problems globally, leading the cause of deaths especially among children and pregnant women particularly in developing countries. This study determined the drug-resistance molecular markers in Plasmodium falciparum infection in three malaria endemic local areas of Benue State, North-central Nigeria between June 2023 and September 2024.

the conclusive diagnosis of P. falciparum was based on identifying the characteristic asexual stage of the parasite in Giemsa-stained blood smears examined under a compound microscope. The DNA (Deoxyribonucleic acid) extraction from P. falciparum positive blood samples was done using Chelex extraction method. Nested polymerase chain reaction followed by Restriction Fragment Length Polymorphisms (PCR/RFLP) were used for the detection of Plasmodium falciparum Chloroquine resistance transporter (pfcrt), P. falciparum multidrug resistance 1 (pfmdr1), P. falciparum dihydrofolate reductase (pfdhfr) and P. falciparum dihydropteroate synthase (pfdhps). Data were analysed using SPSS Version 24.00 and inferences were drawn for Statistical significance at P<0.05.

the results revealed well-characterized molecular markers of P. falciparum resistance to the 4-aminoquinolines and the antifolate drugs indicating a high prevalence of resistance: 41%, 60%, 51% and 47% of P. falciparum isolates at codons N86Y, K76T, S108N, N51I and A437G respectively.

the prevalence of resistance of isolates to antimalarial drugs was significantly high. Therefore, strategies to reduce multiple-strain infections should be implemented to improve antimalarial drug efficacy and reduce the rate of spread of drug resistance.