Koalas are born with chlamydia passed from their mothers

the verdict

SUPPORTED

the evidence backs this

Recorded sources

2 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that koalas are born with chlamydia passed from their mothers?

Yes. While Chlamydia in koalas is primarily spread as a sexually transmitted infection among adults, studies demonstrate that young joeys can acquire the bacteria directly from their mothers.

Verdict: SUPPORTED · 2 sources for, 0 against · Last checked 5 Aug 2026

The analysis

The claim states that koalas are born with or acquire chlamydia from their mothers. Multiple retrieved papers (specifically [0] and [7]) investigate young koalas/joeys and conclude that mother-to-young transmission of Chlamydia pecorum does occur alongside sexual transmission. There are no papers contradicting this finding, supporting a verdict of SUPPORTED.

Evidence for · 2

Epidemiology of chlamydial infection and disease in a free-ranging koala (Phascolarctos cinereus) population

2017

The study found that sexually immature koalas (9-13 months) were already infected with Chlamydia pecorum, suggesting direct mother-to-young transmission occurs.

Get citation

Nyari, S., Waugh, C., Dong, J., Quigley, B., Hanger, J., Loader, J., Polkinghorne, A., & Timms, P. (2017). Epidemiology of chlamydial infection and disease in a free-ranging koala (Phascolarctos cinereus) population. doi.org. https://doi.org/10.1371/journal.pone.0190114

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More for · 1

Prevalence of Chlamydia pecorum in Juvenile Koalas (Phascolarctos cinereus) and Evidence for Protection from Infection via Maternal Immunization

2018

The analysis of koala joeys under one year of age supported the conclusion that mother-to-direct-young transmission of Chlamydia pecorum occurs in addition to sexual transmission.

Get citation

Russell, I., Timms, P., Hanger, J., Loader, J., Gillett, A., & Waugh, C. (2018). Prevalence of Chlamydia pecorum in Juvenile Koalas (Phascolarctos cinereus) and Evidence for Protection from Infection via Maternal Immunization. doi.org. https://doi.org/10.7589/2017-07-183

Related receipts

Is it true that Chlamydia infects wild koala populations in Australia and can cause blindness and infertility? SUPPORTED related question, same topic
Is it true that Koalas in Australia carry Chlamydia pecorum bacteria, which causes blindness and infertility? PARTIAL LEAN related question, same topic

What does the evidence say?

Receipt History

first checked05 Aug 2026

judged → SUPPORTED · 8605 Aug 2026

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