World-first vaccine approved to save Koalas from Chlamydia

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SAguy said:

Did chlamydia jump from humans to koalas or vice versa?

Australians:

Seriously though, Chlamydia is a bacteria that affects a wide range of animals, and apparently the strain affecting Koalas is most similar to one affecting sheep, so it may have infected them via livestock brought over by settlers:

https://www.science.org.au/curious/earth-environment/did-koalas-catch-killer-chlamydia-sheep