# Trichosporon asahii: A Potential Growth Promoter for C. gallinacea? Implications for Chlamydial Infections and Cell Culture

## TL;DR

Researchers found that a microorganism in the chicken gut may help grow a newly identified chlamydia species in the lab, suggesting new ways to study these bacteria.

## Contribution

The study suggests that Trichosporon asahii may act as a growth promoter for Chlamydia gallinacea in vitro.

## Key findings

- Standard protocols failed to culture Chlamydia gallinacea from field samples.
- A co-culture with Trichosporon asahii allowed successful growth of C. gallinacea.
- Host-associated microorganisms may influence the in vivo growth of C. gallinacea.

## Abstract

The cultivation of Chlamydia gallinacea, a recently identified species, is challenging due to the lack of an optimized protocol. In this study, several infection protocols were tested, including different cell lines, incubation temperatures, centrifugation methods and culture media. However, none were successful in field samples. The only exception was a chance co-culture with Trichosporon asahii, a microorganism commonly found in the chicken gut. This suggests that current in vitro methods may not be optimized for this species and that host-associated microorganisms may influence the in vivo growth of C. gallinacea, which is typically found in the chicken gut. These findings raise new questions and highlight the need for further investigation of microbial interactions within the host, particularly to understand their role in the proliferation of chlamydial species.