user: Q: The disease has ravaged the native marsupial, which is under increasing threat.
Microbiologists in Queensland now hope to protect some of the remaining population after successfully trialling a vaccine developed over five years.
Koala numbers have plummeted in recent years and there are believed to be as few as 43,000 left in the wild.
In some areas, numbers have dropped by as much as 80% in the past 10 years.
The strain of chlamydia that affects koalas can lead to blindness, infertility and death among the animals.
In the trial, microbiologists from the University of the Sunshine Coast in Queensland gave 30 koalas the vaccine while 30 others were left unvaccinated.
All 60 were then fitted with radio collars so they could be monitored in their natural habitat at Moreton Bay, north of Brisbane.
Of the 30 vaccinated, some were already infected with chlamydia, some were healthy and some were showing symptoms of the disease such as eye infections and reproductive tract infections.
Researchers said that seven out of eight koalas suffering from eye infections who received the vaccine showed an improvement.
But in the unvaccinated group, four of six koalas with eye infections saw their conditions worsen.
The researchers also found that koalas infected with the chlamydia strain did not go on to develop the full-blown disease after they were vaccinated.
"It's all very promising and it's not just that it's doing the right thing from an immune response point of view, but it's actually protecting a significant number of them out in the wild climbing around trees," Professor Peter Timms told AFP news agency.
The Australian government has classified the koala as a vulnerable species as its numbers plummeted due to habitat loss, disease and other factors.
Prof Timms said chlamydia was one of the "tipping points" contributing to the decline of the animal and it was crucial to stop its spread.
"The vaccine would actually make a difference," he said.
Researchers intend to continue the trial in areas where koalas are most at risk.

A: Australian scientists say they have successfully tested a vaccine aimed at protecting wild koalas from chlamydia.


Q: The US billionaire bought the Turnberry course and hotel in Ayrshire for an undisclosed sum in April.
The resort was subsequently renamed Trump Turnberry.
During his first media conference at the course, Mr Trump said the renaming was not for his "ego" but to make the course "more successful".
He has pledged to spend more than Â£100m on renovating the hotel that overlooks the famous course and said there will be some potential changes to it over the next few years, particularly holes nine to 11.
Mr Trump said he discussed changing the name of the resort with "important people" in Scotland and the world of golf and said he would not have changed it if he thought it would have a negative impact.
Sitting at a large bay window overlooking the famous course with a Trump-branded helicopter on the hotel lawn, he said: "I looked at the name change in the form of logos and it looks so incredible.
"One of the things that I think is good (about the Trump organisation) is we have tremendous success, our buildings are tremendously successful, so if you add it, I'm not doing it for ego, I'm doing it because it's going to make the place more successful.
"If I thought it was going to hurt Turnberry I wouldn't use the name but it's going to make this great resort much more successful than it has been and that's the primary reason I'm doing it.
"If I thought it would have a negative impact, I would not do it. I want to see incredible success for this resort beyond anything else."
He added: "I actually asked some people that are very important in Scotland, although I won't get them in trouble by saying their name, but I've spoken to very important and very powerful political people and I said 'what do you think of the idea of Trump Turnberry?'
"Everyone said that they would love it, I spoke to the higher-ups in the world of golf and one of them said it used to be called Westin Turnberry when the Japanese owned it, I think Trump Turnberry sounds much better."
Mr Trump, was joined at the press conference by his son Eric and golf course architect Martin Ebert, said the hotel is debt-free and there is no mortgage on the property.
He added: "We are going to be spending at least Â£100m on redoing the hotel, on building it up to the highest standards, and I'm talking world standards.
"We have a facility really that can be the finest hotel anywhere in the world, and certainly the finest hotel of its kind anywhere in the world."
Turnberry is on the rota of courses that can stage the Open Championship and Mr Trump said that was a factor is his decision to purchase the resort.
"It's a magnificent tournament, I've watched it for so many years and never missed it," he said.
"It's just an honour to be associated with the Royal and Ancient (golf's governing body) and the tournament potentially.
"It's already had four Opens and the women are coming next year, which I consider very important, and I think the greatness of this course will lead to others, it has to.
"We have now the greatest canvas in all of golf so ultimately people can't avoid it."
Turnberry is Mr Trump's second Scottish course, following on from his Aberdeenshire resort at Menie which opened in July 2012.
Plans for a second golf course, club house and hotel on the same site remain on hold amid a bitter dispute over a proposed wind farm adjacent to the resort, but
Mr Trump said the current course is a success and has been a "big boost" for Aberdeen.

A:

assistant: Tycoon Donald Trump has defended his decision to add his name to one of Scotland's most famous golf courses.