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Sexual Diseases

Sexually transmitted diseases (STDs), once called venereal diseases, are among the most common infectious diseases in the United States today. More than 20 STDs have now been identified, and they affect more than 13 million men and women in this country each year. The annual comprehensive cost of STDs in the United States is estimated to be well in excess of $10 billion.

Understanding the basic facts about STDs - the ways in which they are spread, their common symptoms, and how they can be treated– is the first step toward prevention. The National Institute of Allergy and Infectious Diseases (NIAID), a part of the National Institutes of Health, has prepared a series of fact sheets about STDs to provide this important information. Research investigators supported by NIAID are looking for better methods of diagnosis and more effective treatments, as well as for vaccines and topical microbicides to prevent STDs. It is important to understand at least five key points about all STDs in this country today:

  1. STDs affect men and women of all backgrounds and economic levels. They are most prevalent among teenagers and young adults. Nearly two-thirds of all STDs occur in people younger than 25 years of age.
  2. The incidence of STDs is rising, in part because in the last few decades, young people have become sexually active earlier yet are marrying later. In addition, divorce is more common. The net result is that sexually active people today are more likely to have multiple sex partners during their lives and are potentially at risk for developing STDs.
  3. Most of the time, STDs cause no symptoms, particularly in women. When and if symptoms develop, they may be confused with those of other diseases not transmitted through sexual contact. Even when an STD causes no symptoms, however, a person who is infected may be able to pass the disease on to a sex partner. That is why many doctors recommend periodic testing or screening for people who have more than one sex partner.
  4. Health problems caused by STDs tend to be more severe and more frequent for women than for men, in part because the frequency of asymptomatic infection means that many women do not seek care until serious problems have developed.
  • Some STDs can spread into the uterus (womb) and fallopian tubes to cause pelvic inflammatory disease (PID), which in turn is a major cause of both infertility and ectopic (tubal) pregnancy. The latter can be fatal.
  • STDs in women also may be associated with cervical cancer. One STD, human papillomavirus infection (HPV), causes genital warts and cervical and other genital cancers.
  • STDs can be passed from a mother to her baby before, during, or immediately after birth; some of these infections of the newborn can be cured easily, but others may cause a baby to be permanently disabled or even die.
  1. When diagnosed and treated early, many STDs can be treated effectively. Some infections have become resistant to the drugs used to treat them and now require newer types of antibiotics. Experts believe that having STDs other than AIDS increases one's risk for becoming infected with the AIDS virus.

HIV Infection and AIDS

AIDS (acquired immunodeficiency syndrome) was first reported in the United States in 1981. It is caused by the human immunodeficiency virus (HIV), a virus that destroys the body's ability to fight off infection. An estimated 900,000 people in the United States are currently infected with HIV. People who have AIDS are very susceptible to many life-threatening diseases, called opportunistic infections, and to certain forms of cancer. Transmission of the virus primarily occurs during sexual activity and by sharing needles used to inject intravenous drugs. If you have any questions about HIV infection or AIDS, you can call the AIDS Hotline confidential toll-free number: 1-800-342-AIDS.

Chlamydial Infection

This infection is now the most common of all bacterial STDs, with an estimated 4 to 8 million new cases occurring each year. In both men and women, chlamydial infection may cause an abnormal genital discharge and burning with urination. In women, untreated chlamydial infection may lead to pelvic inflammatory disease, one of the most common causes of ectopic pregnancy and infertility in women. Many people with chlamydial infection, however, have few or no symptoms of infection. Once diagnosed with chlamydial infection, a person can be treated with an antibiotic.

Genital Herpes

Genital herpes affects an estimated 60 million Americans. Approximately 500,000 new cases of this incurable viral infection develop annually. Herpes infections are caused by herpes simplex virus (HSV). The major symptoms of herpes infection are painful blisters or open sores in the genital area. These may be preceded by a tingling or burning sensation in the legs, buttocks, or genital region. The herpes sores usually disappear within two to three weeks, but the virus remains in the body for life and the lesions may recur from time to time. Severe or frequently recurrent genital herpes is treated with one of several antiviral drugs that are available by prescription. These drugs help control the symptoms but do not eliminate the herpes virus from the body. Suppressive antiviral therapy can be used to prevent occurrences and perhaps transmission. Women who acquire genital herpes during pregnancy can transmit the virus to their babies. Untreated HSV infection in newborns can result in mental retardation and death.

Genital Warts

Genital warts (also called venereal warts or condylomata acuminata) are caused by human papillomavirus, a virus related to the virus that causes common skin warts. Genital warts usually first appear as small, hard painless bumps in the vaginal area, on the penis, or around the anus. If untreated, they may grow and develop a fleshy, cauliflower-like appearance. Genital warts infect an estimated 1 million Americans each year. In addition to genital warts, certain high-risk types of HPV cause cervical cancer and other genital cancers. Genital warts are treated with a topical drug (applied to the skin), by freezing, or if they recur, with injections of a type of interferon. If the warts are very large, they can be removed by surgery.

Gonorrhea

Approximately 400,000 cases of gonorrhea are reported to the U.S. Centers for Disease Control and Prevention (CDC) each year in this country. The most common symptoms of gonorrhea are a discharge from the vagina or penis and painful or difficult urination. The most common and serious complications occur in women and, as with chlamydial infection, these complications include PID, ectopic pregnancy, and infertility. Historically, penicillin has been used to treat gonorrhea, but in the last decade, four types of antibiotic resistance have emerged. New antibiotics or combinations of drugs must be used to treat these resistant strains.

Syphilis

The incidence of syphilis has increased and decreased dramatically in recent years, with more than 11,000 cases reported in 1996. The first symptoms of syphilis may go undetected because they are very mild and disappear spontaneously. The initial symptom is a chancre; it is usually a painless open sore that usually appears on the penis or around or in the vagina. It can also occur near the mouth, anus, or on the hands. If untreated, syphilis may go on to more advanced stages, including a transient rash and, eventually, serious involvement of the heart and central nervous system. The full course of the disease can take years. Penicillin remains the most effective drug to treat people with syphilis.

Other diseases that may be sexually transmitted include trichomoniasis, bacterial vaginosis, cytomegalovirus infections, scabies, and pubic lice.

STDs in pregnant women are associated with a number of adverse outcomes, including spontaneous abortion and infection in the newborn. Low birth weight and prematurity appear to be associated with STDs, including chlamydial infection and trichomoniasis. Congenital or perinatal infection (infection that occurs around the time of birth) occurs in 30 to 70 percent of infants born to infected mothers, and complications may include pneumonia, eye infections, and permanent neurologic damage.

What Can You Do to Prevent STDs?

The best way to prevent STDs is to avoid sexual contact with others. If you decide to be sexually active, there are things that you can do to reduce your risk of developing an STD. 

  • Have a mutually monogamous sexual relationship with an uninfected partner.
  • Correctly and consistently use a male condom.
  • Use clean needles if injecting intravenous drugs.
  • Prevent and control other STDs to decrease susceptibility to HIV infection and to reduce your infectiousness if you are HIV-infected.
  • Delay having sexual relations as long as possible. The younger people are when having sex for the first time, the more susceptible they become to developing an STD. The risk of acquiring an STD also increases with the number of partners over a lifetime.

Anyone who is sexually active should:

  • Have regular checkups for STDs even in the absence of symptoms, and especially if having sex with a new partner. These tests can be done during a routine visit to the doctor's office.
  • Learn the common symptoms of STDs. Seek medical help immediately if any suspicious symptoms develop, even if they are mild.
  • Avoid having sex during menstruation. HIV-infected women are probably more infectious, and HIV-uninfected women are probably more susceptible to becoming infected during that time.
  • Avoid anal intercourse, but if practiced, use a male condom.
  • Avoid douching because it removes some of the normal protective bacteria in the vagina and increases the risk of getting some STDs.

Anyone diagnosed as having an STD should:

  • Be treated to reduce the risk of transmitting an STD to an infant.
  • Discuss with a doctor the possible risk of transmission in breast milk and whether commercial formula should be substituted.
  • Notify all recent sex partners and urge them to get a checkup.
  • Follow the doctor's orders and complete the full course of medication prescribed. A follow-up test to ensure that the infection has been cured is often an important step in treatment.
  • Avoid all sexual activity while being treated for an STD.

Sometimes people are too embarrassed or frightened to ask for help or information. Most STDs are readily treated, and the earlier a person seeks treatment and warns sex partners about the disease, the less likely the disease will do irreparable physical damage, be spread to others or, in the case of a woman, be passed on to a newborn baby.

Private doctors, local health departments, and STD and family planning clinics have information about STDs. In addition, the American Social Health Association (ASHA) provides free information and keeps lists of clinics and private doctors who provide treatment for people with STDs. ASHA has a national toll-free telephone number, 1-800-227-8922. The phone number for the Herpes Hotline, also run by ASHA, is 919-361-8488. Callers can get information from the ASHA hotline without leaving their names.

Research

STDs cause physical and emotional suffering to millions and are costly to individuals and to society as a whole. NIAID conducts and supports many research projects designed to improve methods of prevention, and to find better ways to diagnose and treat these diseases. NIAID also supports several large university-based STD research centers.

Within the past few years, NIAID-supported research has resulted in new tests to diagnose some STDs faster and more accurately. New drug treatments for STDs are under investigation by NIAID researchers. This is especially important because some STDs are becoming resistant to the standard drugs. In addition, vaccines are being developed or tested for effectiveness in preventing several STDs, including AIDS, chlamydial infection, genital herpes, and gonorrhea.

It is up to each individual to learn more about STDs and then make choices about how to minimize the risk of acquiring these diseases and spreading them to others. Knowledge of STDs, as well as honesty and openness with sex partners and with one's doctor, can be very important in reducing the incidence and complications of sexually transmitted diseases.


Chlamydial Infection

2011-01-25 09:27:19

What is Chlamydial Infection?

Chlamydial ("kla-MID-ee-uhl") infection is a curable sexually transmitted disease (STD), which is caused by a bacterium called Chlamydia trachomatis. You can get genital chlamydial infection during oral, vaginal, or anal sexual contact with an infected partner. It can cause serious problems in men and women as well as in newborn babies of infected mothers.

Chlamydial infection is one of the most widespread bacterial STDs in the United States. The U.S. ...

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Genital Herpes

2011-01-25 09:28:13

What is genital herpes?

Genital herpes is an infection caused by the herpes simplex virus or HSV. There are two types of HSV, and both can cause genital herpes. HSV type 1 most commonly infects the lips causing sores known as fever blisters or cold sores, but it also can infect the genital area and produce sores there. HSV type 2 is the usual cause of genital herpes, but it also can infect the mouth during oral sex. A person who has genital herpes infection can easily pass or transmit ...

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Gonorrhea

2011-01-25 09:30:15

What is Gonorrhea?

Gonorrhea is a curable sexually transmitted disease (STD) caused by a bacterium called Neisseria gonorrhoeae. These bacteria can infect the genital tract, the mouth, and the rectum. In women, the opening (cervix) to the womb (uterus) from the birth canal is the first place of infection. The disease however can spread into the womb and fallopian tubes, resulting in pelvic inflammatory disease (PID). PID affects more than 1 million women in this country every year and ...

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HIV Infection and AIDS

2011-01-25 09:31:09

AIDS (acquired immunodeficiency syndrome) was first reported in the United States in 1981 and has since become a major worldwide epidemic. AIDS is caused by the human immunodeficiency virus (HIV). By killing or damaging cells of the body's immune system, HIV progressively destroys the body's ability to fight infections and certain cancers. People diagnosed with AIDS may get life-threatening diseases called opportunistic infections, which are caused by microbes such as viruses or bacteria t...

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Syphilis

2011-01-25 09:31:50

Syphilis, once a cause of devastating epidemics, can be effectively diagnosed and treated with antibiotic therapy. In 1996, 11,387 cases of primary and secondary syphilis in the United States were reported to the U.S. Centers for Disease Control and Prevention. Although treatment is available, the early symptoms of syphilis can be very mild, and many people do not seek treatment when they first become infected. Of increasing concern is the fact that syphilis increases the risk of transmitt...

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Genital Warts

2011-01-25 09:50:46

Definition & Overview: Genital warts is a highly contagious sexually transmitted disease caused by the human papillomavirus (HPV) during vaginal, oral or anal sex. There are over 75 different strains of the HPV virus but only 10 of them are responsible for causing genital warts.

Also known as venereal warts, condyloma, condylomata acuminata, genital warts appear as small white, pink, red, or flesh-colored bumps that range in size from unnoticable, to single lesions to clusters similar...

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