The number of new HIV diagnoses in Australia remains the highest in 20 years, according to data released today by UNSW's Kirby Institute.
While rates have remained stable over the past two years, the number of cases detected in 2013 represents a 70% increase on 1999 levels, when HIV diagnoses were at their lowest. In 2013, 1235 new cases of HIV were diagnosed in Australia; in 2012, this figure was slightly higher, at 1253.
There are now an estimated 26,800 people living with HIV in Australia. The Kirby report estimates around one in seven people do not know they have the virus.
HIV is a worldwide issue. But rather than a single, global epidemic, it's better understood as a number of diverse epidemics that require targeted responses.
UNAIDS's "know your epidemic, know your response" recognises that the communities most vulnerable to the epidemic are gay and bisexual men, people who inject drugs, and sex workers.
Let's look at the three epidemics and how they inform responses to HIV – in Australia and around the world.
Gay and bisexual men
–– Andrew Grulich
Gay and bisexual men are over-represented in HIV statistics in virtually every country studied. This is due to a combination of biological reasons (HIV is about ten times more transmissible by anal as compared to vaginal sex) and behavioural reasons (gay and bisexual men are more likely to report multiple sexual partners).
In most developed countries, including Australia, gay and bisexual men dominate numbers of new HIV infections, and infection rates have recently been increasing. Infections are also on the rise in many middle- and lower-income countries. And gay and bisexual men now comprise a large proportion of new infections in several Asian countries.
Traditionally, behavioural prevention focusing on increased condom use has been the mainstay of HIV prevention in gay and bisexual men. In Australia, the majority of gay and bisexual men continue to use condoms most of the time. Nevertheless, as HIV has become a chronic manageable disease in Australia, rates of condomless sex have increased.
The last few years have seen a transformation in available biomedical prevention technologies. The implementation of earlier HIV diagnosis and treatment – coupled with pre-exposure prophylaxis (where people at risk of HIV take antiretroviral medication) against HIV and condom promotion – has the potential to drive down new infection rates.
The scale up of this combination prevention-response in the next few years should tell us if we have the ability to turn the epidemic around.
People who inject drugs
–– Peter Higgs
The Australian response to managing the prevention and treatment of HIV among people who inject drugs has involved all key players: government, health professionals, researchers, scientists, community groups and the affected populations, from which there is much to learn. Unfortunately, the response has not been as successful in the wider Asia-Pacific region.
While HIV is largely driven by men who have sex with men in Australia, it is the sharing of drug-injecting equipment that contributes to more cases of HIV across our region than other routes of transmission. In China, around 28% of all people living with HIV have been infected as a result of injecting drugs. In Indonesia, this number is 36%.
In countries where HIV is prevalent among people who inject drugs, the key tools of prevention – needles, syringes and condoms – are cheap and readily available. But the criminalisation of drug use and the discrimination faced by people who inject drugs means access to these tools remains less than optimal.
Effective drug treatment programs, especially the development of opiate substitution programs is also important for the reduction of frequency in injecting drug use. In Vietnam and China, these programs are being scaled up markedly but they start from a very low base.
Researchers and health-care workers must also respond to the changes in drug use patterns; understanding any shifts from heroin use to amphetamine-type stimulants (ATS) and from smoking drugs to injecting drugs is essential to limiting HIV transmission. The reduction of potential harms can only be achieved if drug users themselves are included at the forefront of the response.
Finally, it is crucial that people who inject drugs are given the same access to HIV testing and treatment. This is a challenge in countries with severe drug-related laws and policies, but is vitally important to controlling the spread of HIV.
–– Cheryl Overs
The criminalisation of sex work remains one of the most significant barriers to controlling the HIV transmission among sex workers around the world.
Take Indonesia, for example, where 9% of sex workers are HIV-positive, compared with 0.3% of the general population. It has some of the harshest laws against sex work in the region, as well as a variety of broad pornography laws that hinder HIV prevention and education strategies.
The criminalisation of sex workers' clients is already having disastrous impact in several countries; HIV criminalisation particularly affects sex workers and laws often conflate sex work and trafficking.
For sex workers to benefit from the biomedical advances in HIV, it's important to integrate pre-exposure prophylaxis and treatment-as-prevention measures into broader HIV interventions. Treating HIV-positive people prevents onward transmission.
This means finding ways to increase HIV testing, educating the community about HIV science, and crucially, convincing clients that condom use must continue. It also means removing the barriers to accessing medical care because the success of biomedical prevention depends on access to testing and treatment.
In responding to the diverse needs of key affected communities, it is vital that the response includes not just HIV science and research but also a response to the social needs of these key affected communities.
The 2014 International AIDS Conference, to be held in Melbourne from Sunday, will bring key advocates, scientists and communities together to discuss ideas and research on responses to HIV in these three key vulnerable communities.
Explore further: Wednesday is national HIV testing day