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Female Loa loa worm polyinfection in human hosts
Jeanne A Rajaonarivelo1, Cédric Mariac2, Philippe Cubry2
1TransVIHMI, University of Montpellier, IRD, INSERM, Montpellier, France.
Parasitology
|November 26, 2025
Summary
This study developed a method to estimate the number of adult Loa loa worms in individuals by analyzing genetic variations in microfilariae DNA. This helps understand loiasis and potential co-infections.
Area of Science:
- Parasitology
- Molecular Biology
- Genetics
Background:
- Loiasis, caused by *Loa loa*, is prevalent in Central Africa.
- High microfilaraemia correlates with acute symptoms, but adult worm burden remains unclear.
- Understanding worm burden is crucial for managing loiasis.
Purpose of the Study:
- To assess polyinfection by multiple *Loa loa* female worms using mitochondrial DNA variation.
- To establish a method for estimating adult *Loa loa* worm burden.
- To investigate the relationship between microfilaraemia and adult worm burden.
Main Methods:
- Optimized DNA extraction from microfilariae for genetic analysis.
- Utilized Illumina sequencing to analyze mitochondrial genome variation.
- Identified Single Nucleotide Polymorphisms (SNPs) and estimated haplotype diversity.
Main Results:
- Optimized DNA extraction yielded significantly more parasite DNA.
- Microfiltration improved parasite DNA mapping rates.
- Analysis revealed 7 to 20 mitochondrial DNA haplotypes per individual, indicating multiple fertile female worms.
Conclusions:
- This study presents the first approach to estimate *Loa loa* female worm burden.
- Mitochondrial DNA haplotype analysis can reveal polyinfection in loiasis.
- Findings highlight the potential for multiple reproductive female worms in infected individuals.
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