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The World Health Organization estimates that more than 1 million people are infected with a new sexually transmitted disease (STD) each day. Across the globe, there are more than 340 million new curable STD infections each year in addition to 33 million new HIV infections and 100 million infections with other viral STDs. Although STDs are largely preventable infections, they are one of the most common reasons that adults seek medical care, and they have an enormous impact on multiple dimensions of global health.

The financial costs of STD management are also significant. In low- and middle-income countries, the price of medication for a curable STD is often several times the average daily income. Furthermore, in addition to the medical expenses associated with their direct treatment and prevention, STDs are associated with significant indirect costs from lost productivity, decreased fertility, and associated health burdens.

Examining the Global STD Epidemic

Sexually transmitted diseases can be broken down into two types: curable, bacterial STDs such as gonorrhea, chlamydia, syphilis, and trichomoniasis and incurable viral STDs such as herpes and the human papillomavirus (HPV). Although HIV is technically included in the second category, it is often considered as a separate entity in the discussion of global health, because of its extremely high morbidity and mortality rate compared to other viral STDs. The World Health Organization estimates that, worldwide, HIV causes almost 20 times as many as deaths as do other STDs. However, the HIV and other STD epidemics are tightly intertwined, as HIV is frequently sexually transmitted and STD infection significantly increases an individual's risk of HIV. Programs that encourage the prevention and treatment of other STDs thus also both directly and indirectly affect the spread of HIV.

Methods of Prevention

Although abstinence from all forms of sexual contact outside of a mutually monogamous relationship with an uninfected partner is the only guaranteed method of preventing STDs, there are other ways in which individuals can reduce their STD risk. Latex condoms are extremely effective at preventing STDs such as gonorrhea and chlamydia, which are spread by transmission of infected bodily fluids, and they can also reduce the risk of diseases such as herpes and HPV that are spread by skin-to-skin contact.

Condoms are most effective when they are used consistently and not just for vaginal intercourse but also for oral and anal sex. Although transmission of HIV during oral sex is relatively uncommon, in recent years there has been a growing awareness of the importance of oral sex as a transmission route for other STDs, including gonorrhea, syphilis, and HPV.

Regular screening and effective treatment also play important roles in the prevention of curable STDs. Although there is a growing problem with antibiotic-resistant gonorrhea strains, the biggest obstacle to treating curable STDs is not medication but detection. Treatment cannot be based on symptoms alone, because STDs are often asymptomatic, particularly in women. The only way to effectively identify individuals who are infected with STDs is to actively screen everyone who is at risk, which can be difficult in countries that lack medical funding and/or infrastructure. Screening and treatment efficacy can, however, be increased by presumptively contacting and treating infected individuals' recent sexual contacts.

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