This FACT indicates the proportion of diagnosed chlamydia cases per 100,000 people in each Australian state and territory. Chlamydia infection (from the Greek, χλαμýδα meaning 'cloak') is a common sexually transmitted infection (STI) in humans caused by the bacterium Chlamydia trachomatis. Of course, only diagnosed cases can be counted, and therefore the statistics should be taken with caution as true numbers are likely to be higher. Nonetheless, there is a wide difference between cities that are ranked first and last, by number of cases as a proportion of population. Chlamydia is spread partly due to lack of education and knowledge about the infection, which is treatable and curable.
These numbers represent the statistics for 2010. The territory with the most diagnosed cases is the Northern Territory with 1161.2 per 100,000 people. The state with the least is New South Wales with 280.5 per 100,000 people.