Koala

Sept. 15, 2025

Recently, Australia approved the world's first vaccine to save koalas from Chlamydia.

About Koala:

  • Koala bear (Phascolarctos cinereus) is an arboreal herbivorous marsupial native to Australia.
  • It is the only extant representative of the family Phascolarctidae and its closest living relatives are the wombats.
  • Koalas are asocial animals, congregating only during the breeding season.
  • They spend most of their time eating and sleeping in eucalyptus trees, and their paws have two opposing thumbs to help them grasp and climb up tree trunks.
  • Habitat: They can be found in habitats ranging from relatively open forests to woodlands, and in climates ranging from tropical to cool temperate.
  • Distribution: Koalas are distributed across eastern and southeastern Australia, including northeastern, central, and southeastern Queensland, eastern New South Wales, Victoria as well as southeastern parts of South Australia.
  • Food: Koalas are herbivorous (folivorous) animals, feeding primarily upon the leaves of the eucalyptus tree.
  • Conservation status: IUCN: Vulnerable
  • Threats: These species are facing compounded threats from disease, habitat loss, climate change and road collisions.

Chlamydia in koalas

  • Koalas suffer from both bacterium species Chlamydia pneumonia and Chlamydia pecorum.
  • The disease occurs in koalas multiple ways, including through mating, infected discharges and at birth. 
  • It can cause eye infections, blindness, urinary tract problems, and even infertility.
  • Infected koalas often become weak, dehydrated, and more vulnerable to predators and bushfires.
  • In some areas of Australia, up to 70% of wild koalas carry the disease.
  • Chlamydia spreads quickly in koalas because they live in overlapping territories and groom each other.

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