Prevention of HIV/AIDS(Redirected from HIV prevention)
HIV prevention might refer to practices done to prevent the spread of HIV/AIDS. HIV prevention practices may be done by individuals to protect "their own health" and the health of those in their community, or may be instituted by governments or other organizations as "public health policies".
Some commonly considered pharmaceutical interventions for the prevention of HIV might include the use of:
Of these, the only universally medically proven method for preventing the spread of HIV during sexual intercourse is the correct use of condoms, and condoms are also the only method promoted by health authorities worldwide. For HIV-positive mothers wishing to prevent the spread of HIV to their children during birth, antiretroviral drugs have been medically proven to reduce the likelihood of the spread of the infection. Scientists worldwide are currently researching other prevention systems.
Increased risk of contracting HIV often correlates with infection by other diseases, particularly other sexually transmitted infections. Medical professionals and scientists recommend treatment or prevention of other infections such as herpes, hepatitis A, hepatitis B, hepatitis C, human papillomavirus, syphilis, gonorrhea, and tuberculosis as an indirect way to prevent the spread of HIV infection. Often doctors treat these conditions with pharmaceutical interventions.
As of September 2013, condoms are available inside prisons in Canada, most of the European Union, Australia, Brazil, Indonesia, South Africa, and the US state of Vermont (on September 17, 2013, the Californian Senate approved a bill for condom distribution inside the state's prisons, but the bill was not yet law at the time of approval).
Social strategies do not require any drug or object to be effective, but rather require persons to change their behaviors to gain protection from HIV. Some social strategies which people consider include:
Each of these strategies has widely differing levels of efficacy, social acceptance, and acceptance in the medical and scientific communities.
Populations which receive HIV testing are less likely to engage in behaviors with high risk of contracting HIV, so HIV testing is almost always a part of any strategy to encourage people to change their behaviors to become less likely to contract HIV.
Over 60 countries impose some form of travel restriction, either for short- or long-term stays, for people infected with HIV.
Advertising and campaignsEdit
Persuasive messages delivered through health advertising and social marketing campaigns which are designed to educate people about the danger of HIV/AIDS and simple prevention strategies are also an important way of preventing HIV/AIDS. These persuasive messages have successfully increased people's knowledge about HIV. More importantly, information sent out through advertising and social marketing also proves to be effective in promoting more favorable attitudes and intentions toward future condom use, though they did not bring significant change in actual behaviors except those were targeting at specific behavioral skills.
In the mean time, research in health communication also found that importance of advocating critical skills and informing available resources are higher for people with lower social power, but not necessarily true for people with more power. African American audiences need to be educated about strategies they could take to efficiently manage themselves in health behaviors such as mood control, management of drugs, and proactive planning for sexual behaviors. However, these things are not as important for European Americans.
Consistent condom use reduces the risk of heterosexual HIV transmission by about 80% over the long-term. Where one partner of a couple is infected, consistent condom use results in rates of HIV infection for the uninfected person below 1% per year. Some data support the equivalence of female condoms to latex condoms, but the evidence is not definitive. The use of the spermicide nonoxynol-9 may increase the risk of transmission because it causes vaginal and rectal irritation. A vaginal gel containing tenofovir, a reverse transcriptase inhibitor, when used immediately before sex, reduces infection rates by roughly 40% among African women.Celum, C; Baeten, JM (February 2012). "Tenofovir-based pre-exposure prophylaxis for HIV prevention: evolving evidence.". Current Opinion in Infectious Diseases. 25 (1): 51–7. PMC . PMID 22156901. doi:10.1097/QCO.0b013e32834ef5ef.</ref>
Circumcision in sub-Saharan Africa reduces the risk of HIV infection in heterosexual men between 38 and 66% over two years. Based on these studies, the World Health Organization and UNAIDS both recommended male circumcision as a method of preventing female-to-male HIV transmission in 2007. Whether it protects against male-to-female transmission is disputed and whether it is of benefit in developed countries and among men who have sex with men is undetermined. For men who have sex with men there is some evidence that the penetrative partner has a lower chance of contracting HIV. Some experts fear that a lower perception of vulnerability among circumcised men may result in more sexual risk-taking behavior, thus negating its preventive effects. Women who have undergone female genital cutting have an increased risk of HIV.
Programs encouraging sexual abstinence do not appear to affect subsequent HIV risk in high-income countries. Evidence for a benefit from peer education is equally poor. Comprehensive sexual education provided at school may decrease high risk behavior. A substantial minority of young people continue to engage in high-risk practices despite HIV/AIDS knowledge, underestimating their own risk of becoming infected with HIV. It is not known if treating other sexually transmitted infections is effective in preventing HIV.
Early treatment of HIV-infected people with antiretrovirals protected 96% of partners from infection. Pre-exposure prophylaxis with a daily dose of tenofovir with or without emtricitabine is effective in a number of groups, including men who have sex with men, couples where one is HIV positive, and young heterosexuals in Africa.
Universal precautions within the health-care environment are believed to be effective in decreasing the risk of HIV. Intravenous drug use is an important risk factor and harm reduction strategies such as needle-exchange programmes and opioid substitution therapy appear effective in decreasing this risk.
Needle exchange programs (also known as syringe exchange programs) are effective in preventing HIV among IDUs and in the broader community. Pharmacy sales of syringes and physician prescription of syringes have been also found to reduce HIV risk. Supervised injection facilities are also understood to address HIV risk in the most-at-risk populations. Multiple legal and attitudinal barriers limit the scale and coverage of these "harm reduction" programs in the United States and elsewhere around the world.
The American Centers for Disease Control and Prevention (CDC) conducted a study in partnership with the Thailand Ministry of Public Health to ascertain the effectiveness of providing people who inject drugs illicitly with daily doses of the antiretroviral drug tenofovir as a prevention measure. The results of the study revealed a 48.9% reduced incidence of the virus among the group of subjects who received the drug, in comparison to the control group who received a placebo. The principal investigator of the study stated in the Lancet medical journal: "We now know that pre-exposure prophylaxis can be a potentially vital option for HIV prevention in people at very high risk for infection, whether through sexual transmission or injecting drug use."
A course of antiretrovirals administered within 48 to 72 hours after exposure to HIV-positive blood or genital secretions is referred to as post-exposure prophylaxis. The use of the single agent zidovudine reduces the risk of subsequent HIV infection fivefold following a needle stick injury. Treatment is recommended after sexual assault when the perpetrators are known to be HIV positive, but is controversial when their HIV status is unknown. Current treatment regimens typically use lopinavir/ritonavir and lamivudine/zidovudine or emtricitabine/tenofovir and may decrease the risk further. The duration of treatment is usually four weeks and is associated with significant rates of adverse effects (for zidovudine about 70% including: nausea 24%, fatigue 22%, emotional distress 13%, and headaches 9%).
Strategies to reduce recurrence rates of HIV have been successful in preventing reinfection. Treatment facilities encourage those previously treated for HIV return to ensure that the infection is being successfully managed. New strategies to encouraging retesting have been the use of text messaging and email. These methods of recall are now used along with phone calls and letters.
Programs to prevent the transmission of HIV from mothers to children can reduce rates of transmission by 92-99%. This primarily involves the use of a combination of antivirals during pregnancy and after birth in the infant but also potentially include bottle feeding rather than breastfeeding. If replacement feeding is acceptable, feasible, affordable, sustainable and safe mothers should avoid breast-feeding their infants; however, exclusive breast-feeding is recommended during the first months of life if this is not the case. If exclusive breast feeding is carried out the provision of extended antiretroviral prophylaxis to the infant decreases the risk of transmission.
As of 2012, no effective vaccine for HIV or AIDS is known. A single trial of the vaccine RV 144 found a partial efficacy rate around 30% and has stimulated optimism in the research community regarding developing a truly effective vaccine. Further trials of the vaccine are ongoing.
Laws criminalizing HIV transmission have not been found an effective way to reduce HIV risk behavior, and may actually do more harm than good. In the past, many U.S. states criminalized the possession of needles without a prescription, even going so far as to arrest people as they leave private needle-exchange facilities. In jurisdictions where syringe prescription status presented a legal barrier to access, physician prescription programs had shown promise in addressing risky injection behaviors. Epidemiological research demonstrating that syringe access programs are both effective and cost-effective helped change state and local laws relating to needle-exchange program (NEP) operations and the status of syringe possession more broadly. As of 2006, 48 states in the United States authorized needle exchange in some form or allowed the purchase of sterile syringes without a prescription at pharmacies.
Removal of legal barriers to operation of NEPs and other syringe access initiatives has been identified as an important part of a comprehensive approach to reducing HIV transmission among injection drug users (IDUs). Legal barriers include both "law on the books" and "law on the streets," i.e., the actual practices of law enforcement officers, which may or may not reflect the formal law. Changes in syringe and drug-control policy can be ineffective in reducing such barriers if police continue to treat syringe possession as a crime or participation in NEP as evidence of criminal activity.  Although most NEPs in the US are now operating legally, many report some form of police interference.
Research elsewhere has shown similar misalignment between "law on the books" and "law on the streets". For example, in Kyrgyzstan, although sex work, syringe sales, and possession of syringes are not criminalized and possession of a small amount of drug has been decriminalized, gaps remain between these policies and law enforcement knowledge and practice. To optimize public health efforts targeting vulnerable groups, law enforcement personnel and public health policies and practices should be closely aligned. Such alignment can be improved through policy, training, and coordination efforts.
Quality in preventionEdit
The EU-wide ‘Joint Action on Improving Quality in HIV Prevention’, is seeking to increase the effectiveness of HIV prevention in Europe by using practical quality assurance (QA) and quality improvement (QI) tools.
The Centers for Disease Control was the first organization to recognize the pandemic which came to be called AIDS. Their announcement came on June 5, 1981 when one of their journals published an article reporting five cases of pneumonia, caused by Pneumocystis jirovecii, all in gay men living in Los Angeles.
In May 1983, scientists isolated a retrovirus which was later called HIV from an AIDS patient in France. At this point, the disease called AIDS was proposed to be caused by HIV, and people began to consider prevention of HIV infection as a strategy for preventing AIDS.
In the 1980s, public policy makers and most of the public could not understand that the overlap of sexual and needle-sharing networks with the general community had somehow lead to many thousands of people worldwide becoming infected with HIV. In many countries, leaders and most of the general public denied both that AIDS and the risk behaviors which spread HIV existed outside of concentrated populations.
In 1987, the United States FDA approved AZT as the first pharmaceutical treatment for AIDS. Around the same time, ACT UP was formed, with one of the group's first goals being to find a way to get access to pharmaceutical drugs to treat HIV. When AZT was made publicly available, it was extremely expensive and unaffordable to all but the most wealthy AIDS patients. The availability of medicine but the lack of access to it sparked large protests around FDA offices.
In 2003, Swaziland and Botswana reported nearly four out of 10 people were HIV positive. Festus Mogae, president of Botswana, admitted huge infrastructure problems to the international community and requested foreign intervention in the form of consulting in health care setup and antiretroviral drug distribution programs. and from this began to be personally involved in HIV issues worldwide. In Swaziland, the government chose not to immediately address the problem in the way that international health agencies advised, so many people died. In world media, the governments of African countries began to similarly be described as participating in the effort to prevent HIV actively or less actively.
There came to be international discussion about why HIV rates in Africa were so high, because if the cause were known, then prevention strategies could be developed. Previously, some researchers had suggested that HIV in Africa was widespread because of unsafe medical practices which somehow transferred blood to patients through procedures such as vaccination, injection, or reuse of equipment. In March 2003, the WHO released a statement that almost all infections were, in fact, the result of unsafe practices in heterosexual intercourse.
In response to the rising HIV rates, Cardinal Alfonso López Trujillo, speaking on behalf of the Vatican, said that not only was the use of condoms immoral, but also that condoms were ineffective in preventing HIV. The cardinal was highly criticized by the world health community, who were trying to promote condom use as a way to prevent the spread of HIV.
In 2001, the United States began a war in Afghanistan related to fighting the Taliban. The Taliban, however, had opposed local opium growers and the heroin trade; when the government of Afghanistan fell during the war, opium production was unchecked. By 2003, the world market had an increase in the available heroin supply; in former Soviet states especially, an increase in HIV infection was due to injection drug use. Efforts were renewed to prevent HIV related to sharing needles.
In July 2011, it was announced by the WHO and UNAIDS that a once-daily antiretroviral tablet could significantly reduce the risk of HIV transmission in heterosexual couples. These findings were based on the results of two trials conducted in Kenya and Uganda, and Botswana.
The Partners PrEP (pre-exposure prophylaxis) trial was funded by the Bill and Melinda Gates Foundation and conducted by the International Clinical Research Center at the University of Washington. The trial followed 4758 heterosexual couples in Kenya and Uganda, in which one individual was HIV positive and the other was HIV negative. The uninfected (HIV negative) partner was given either a once-daily tenofovir tablet, a once-daily combination tablet of tenofovir and emtricitabine, or a placebo tablet containing no antiretroviral drug. These couples also received counselling and had access to free male and female condoms. In couples taking tenofovir and tenofovir/emtricitabine, there was a 62% and 73% decrease, respectively, in the number of HIV infections as compared to couples who were receiving the placebo.
A similar result was observed with the TDF2 trial, conducted by the United States Centers for Disease Control in partnership with the Botswana Ministry of Health. The trial followed 1200 HIV negative men and women in Francistown, Botswana, a city known to have one of the world's highest HIV infection rates. Participants received either a once-daily tenofovir/emtricitabine combination tablet or a placebo. In those taking the antiretroviral treatment, there was found to be a 63% decrease in the risk of acquiring HIV, as compared to those receiving the placebo.
The HIV-1 virus has proved to be tenacious, inserting its genome permanently into victims' DNA, forcing patients to take a lifelong drug regimen to control the virus and prevent a fresh attack. Now, a team of Temple University School of Medicine researchers have designed a way to "snip out" the integrated HIV-1 genes for good.
This is one important step on the path toward a permanent cure for AIDS. This is the first successful attempt to eliminate latent HIV-1 virus from human cells.
In a study published by the Proceedings of the National Academy of Sciences (PNAS), Dr. Khalili and colleagues detail how they created molecular tools to delete the HIV-1 proviral DNA. When deployed, a combination of DNA-snipping enzyme called a nuclease and targeting strand of RNA called a guide RNA (gRNA) hunt down the viral genome and excise the HIV-1 DNA. From there, the cell's own gene repair machinery takes over, soldering the loose ends of the genome back together – resulting in virus-free cells.
Since HIV-1 is never cleared by the immune system, removal of the virus is required in order to cure the disease. The same technique could theoretically be used against a variety of viruses. The research shows that these molecular tools also hold promise as a therapeutic vaccine; cells armed with the nuclease-RNA combination proved impervious to HIV infection.
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