# A major entomoparasite interferes with the chikungunya virus transmission by Aedes albopictus

## TL;DR

A common parasite in tiger mosquitoes reduces the spread of chikungunya virus, potentially affecting disease outbreaks.

## Contribution

The study shows that Ascogregarina taiwanensis reduces chikungunya transmission by Aedes albopictus.

## Key findings

- The parasite Ascogregarina taiwanensis slows chikungunya virus spread in mosquitoes.
- Infected mosquitoes transmit the virus at half the rate of unparasitized ones.
- Microbial changes in mosquitoes may influence disease outbreaks and public health.

## Abstract

The Asian tiger mosquito, Aedes albopictus, is an invasive species that spreads diseases like chikungunya and has caused outbreaks worldwide. Studies show that mosquito‐associated microbes can affect disease transmission. One of those microbes, the parasite Ascogregarina taiwanensis, is common in native and settled mosquito populations (>3 years after introduction) but rare in recently introduced ones. We found that this parasite slows down the spread of the chikungunya virus within the mosquito and decreases its transmission rate by half. Unparasitized mosquitoes spread the virus more easily, suggesting that changes in mosquito‐associated microbes could impact disease outbreaks and public health.