No, you can’t get chlamydia from a koala. But getting tested for chlamydia and other sexually transmitted infections (STIs) can help protect not only yourself and your community, but the planet itself. Let’s unpack how.
If you caught this season of his Island of Loveyou may remember a contestant confidently claiming that humans can get chlamydia from koalas. While both species are affected by Chlamydia bacteria, carry separate strains – there is no cross-species transmission. However, this viral moment offers a surprisingly useful teaching tool for sexual health professionals: it highlights how deeply interconnected human, animal and environmental health really are.
Chlamydia: Common, often silent and persistent
Chlamydia is the most common diagnosed STDs in the world. Within the US only, about 1.5 million cases were diagnosed last yearaccounting for about 2 out of every 3 STD cases. And this is only the tip of the iceberg.
Because most infections are asymptomatic, many people do not realize they have chlamydia, meaning the true number of infections is estimated to be almost double from what is mentioned. they count young people aged 15-24 about half of all new infectionsbut as we know, anyone who is sexually active is at risk.
Testing remains one of the most effective prevention tools. By encouraging regular STD testing, we can break chains of transmission, initiate early treatment, and prevention of long-term health consequences.
Potential long-term health effects include:
Pelvic inflammatory disease (PID): For those with uteruses, PID can cause hospitalization, chronic pelvic pain, and infertility.
Pregnancy complications: Chlamydia can lead to premature labor and can be transmitted to newborns during delivery.
Infertility: Infections can cause damage to the fallopian tubes or uterus, and in people with testicles, can affect sperm health.
Epididymitis: Infection and inflammation of the epididymis, which can spread to the testicles and cause pain or swelling.
Increased risk of acquiring HIV: Chlamydia infection can increase susceptibility to HIV and other STIs.
Reactive arthritis: A rare but documented complication that can affect the joints, eyes and urinary system.
For providers, reinforcing the message that “testing is care” helps normalize prevention and reduces stigma – two critical steps in closing the gap between infection and intervention.
When healthcare meets climate care and STD testing
This is where the One Health connection comes in An approach to health it brings people, animals and the environment under one common goal – keeping everyone healthy. It recognizes that the well-being of people, animals, plants and ecosystems are interrelated and that protecting one person ultimately protects them all.
Globally, the health sector accounts for approx 5% of greenhouse gas emissions. Early detection and treatment reduces complications, specialist visits and medical waste. In contrast, untreated infections often require more intensive care, causing higher costs and greater environmental impact.
Only in the US are new STDs coming to an end $16 billion in direct medical costs annually – a reminder that prevention is not just a personal or public health investment, but an environmental one.
The growing threat of antimicrobial resistance (AMR)
Gonorrhea, in particular, has become increasingly resistant to almost all available antibiotics. This is an example of antimicrobial resistance (AMR), which has now been designated an urgent global health threat by the World Health Organization.
And now more attention is being paid to chlamydia. Reports of drug resistance have emerged, including a recent study that reported 1 in 10 chlamydia infections fail azithromycin treatment.
For our sexual health professionals, this highlights the importance of preventive interventions. Every infection prevented is one less opportunity for resistant strains to emerge, protecting not only future patients but our shared ecosystems. AMR does not respect species boundaries. it can circulate in humans, animals and the environment, threatening wildlife and biodiversity.
Vaccines on the Horizon: Lessons from Koalas
Koalas, too, are in the midst of a chlamydia crisis. Their infections cause blindness, sterility and contribute to population decline. In response, Australia recently launched one Chlamydia vaccination campaign for koalaswhich he has shown promising protection.
Human vaccine research is also progressing. Several gonorrhea vaccine candidates are in clinical trials, and some evidence suggests that existing meningococcal B vaccines may offer partial cross-protection.
A new systematic review pooled research from several countries and found that, depending on the dose, the vaccine provided moderate protection against gonorrhea – between 23% and 47%. However, one study suggested that this protection may begin to wane around three years after vaccination.
Researchers are also investigating chlamydia vaccine options for humans. These scientific advances could transform STD prevention – shifting our field from reactive treatment to preventive immunity.
As sexual health professionals, staying current on vaccine research prepares us to answer people’s questions, build confidence in the vaccine, and integrate emerging prevention tools into models of care.
STI Testing: Common Challenges, Common Solutions
Whether it’s humans or koalas, the barriers to health are often surprisingly similar. For people, limited access to care, stigma and systemic inequities continue to make testing for STIs more difficult than it should be, a reality shaped by long shadow of reproductive injustice and lack of universal health care. And as policy changes, new challenges continue to emerge, affecting the kind of sexual health education and services people can actually access. For koalas, even well-intentioned relief efforts can sometimes upset delicate ecosystems, showing how interconnected these systems really are.
In both cases, early detection, surveillance and prevention remain key. When we support testing, counseling and reducing stigma in our own communities, we contribute to global efforts to reduce the burden of disease – across species and systems.
A call to health action for STD control
Encouraging STD testing doesn’t just protect individuals. strengthens communities, promotes health equity and supports planetary prosperity. As sexual health professionals, we are uniquely positioned to bridge these connections – to show that caring for sexual health is also caring for the health of our shared world.
So no, the test won’t directly save koalas. But it might just help protect everything we love – from our relationships to our ecosystems.
