Sexually Transmitted Infections.
Publié le 11/05/2013
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D Genital Herpes
Genital herpes is caused by infection with the herpes simplex virus (HSV).
Most cases of genital herpes are due to HSV type 2.
Some cases, however, result from genitalinfections with HSV type 1, a common cause of cold sores.
Genital herpes causes recurrent outbreaks of painful sores on the genitals, although the disease oftenremains dormant with no symptoms for long periods.
In the United States, one in five individuals over the age of 12 is infected with HSV type 2, and the vast majorityof those infected—about 90 percent—do not know they have the disease.
Blood tests can detect HSV infection, even if a person has no symptoms.
The symptoms ofHSV can be treated with antiviral drugs, such as acyclovir, but HSV cannot be eradicated from the body—it is incurable.
E AIDS
AIDS, the result of infection with the human immunodeficiency virus (HIV), is an incurable and deadly STI.
AIDS attacks the body’s immune system, leaving victimsunable to fight off even the mildest infections.
While HIV can be transmitted by other means, sexual contact is the most common means of transmission.
Women whoare infected with HIV can pass the virus to their infants during pregnancy, childbirth or, less frequently, in breast milk.
Treatment options for people infected with HIVinclude protease inhibitors, which can markedly increase survival.
In spite of widespread educational and prevention programs, the CDC estimates that there are 40,000new cases of HIV each year in the United States and that 800,000 to 900,000 Americans overall have HIV infection.
F Hepatitis B
One hundred times more contagious than HIV, hepatitis B passes from person to person through unprotected sexual intercourse with an infected person, or through thesharing of infected needles or other sharp instruments that break the skin.
Hepatitis B can also spread during childbirth: Between 90 and 95 percent of all babies bornto infected mothers get the disease during birth.
The CDC estimates that 120,000 new hepatitis B infections occur each year.
Hepatitis B attacks liver cells, sometimesleading to cirrhosis and cancer of the liver.
In most cases hepatitis B is incurable, but arduous chemotherapy can eliminate the virus in some patients.
There is a safe,effective vaccination for hepatitis B, and most states are developing or already have initiated public school immunization programs.
G Genital Warts
Genital warts grow on the penis and in and around the entrance to the vagina and anus.
They are caused by a family of viruses known as human papillomavirus (HPV)that are transmitted during sexual intercourse.
The CDC estimates that there are 5.5 million new cases of genital warts in the United States each year.
Genital warts aretreatable with topical medications and can be removed with minor surgical procedures.
Certain types of HPV that cause genital infections can also cause cervical cancer.Regular pap smear screenings can detect abnormalities at an early stage, when they can more easily be treated to prevent cancer developing.
The first vaccine againstHPV strains that can cause genital warts and cervical cancer was approved by the U.S.
Food and Drug Administration and by Health Canada in 2006.
Sold under thebrand name Gardasil, the new vaccine completely prevented infections in women in nearly all clinical trials.
H Trichomoniasis
Trichomoniasis, caused by infection with the protozoan Trichomonas vaginalis, causes burning, itching, and discomfort in the vagina in women and the urethra in men. Trichomoniasis is easily treated with a single dose of antibiotics.
The CDC estimates that 5 million Americans become infected with trichomoniasis each year.
IV PREVENTION AND CONTROL
Unlike many serious diseases, simple measures can prevent STIs.
The most effective prevention method is abstinence—that is, refraining from sex completely.
Nosexual contact means no risk of developing an STI.
Practicing monogamy, in which two partners do not have sexual relations with anyone but each other, also greatlyreduces the risk of spreading and contracting STIs.
Latex condoms are an effective, although not perfect, form of protection from STIs.
These plastic sheaths, worn over the penis or inserted into the vagina, act as aphysical barrier to organisms that cause STIs.
However, condoms do not cover all of the genital surfaces that may come into contact during sex, and the possibility oftransmission of some STIs, especially genital herpes and warts, still exists.
Early diagnosis and thorough treatment prevent the more serious consequences of STI infection, while halting the spread of STIs from person to person.
This is mostcritical in STIs that do not cause symptoms, because those infected often do not know they risk infecting their sexual partners.
The complete dosage of drug treatmentmust be completed, even if early doses of drugs appear to alleviate symptoms entirely.
The infection may still persist in the absence of symptoms, leading infectedindividuals to unknowingly spread the disease.
Public clinics screen patients at risk for STIs in order to diagnose and treat diseases in the early stages.
Clinics track the incidence of STIs in particular areas and contactthe sexual partners of infected individuals.
By identifying and treating these potential carriers, clinics are able to break the chain of STI infections.
Several organizations,such as the CDC and the World Health Organization, monitor and research the prevalence and transmission of STIs on an international level in an effort to prevent localoutbreaks from reaching global, epidemic proportions.
V TRENDS IN STIS
At any time in history, the prevalence and significance of different STIs mirror changes in science and society.
For example, in many countries of the world, theincidence of STIs increased during and immediately after World War II (1939-1945), when soldiers spending extended periods of time away from home engaged inunprotected sexual relations with different partners, many of whom carried STIs.
When the antibiotic penicillin became widely available in the following years, the samecountries experienced dramatic reductions in STI incidence.
Beginning in the 1950s, however, the incidence of gonorrhea began to rise as American sexual moreschanged.
Strains of the disease developed resistance to penicillin, and by the 1970s and 1980s the disease reached epidemic proportions in young adult populations.Introduction of HIV into the human population led to an international AIDS crisis that began in the 1980s and continues to this day.
Cases of STIs are increasing, even though the use of condoms has increased since the onset of the AIDS epidemic.
Public health officials believe that many factors areprobably responsible for the increase in STIs, among them trends in sexual behavior.
In the last several decades, the age at which people have sex for the first time hasshifted downward, while the average number of partners a person has sex with during his or her lifetime has increased.
Together, these trends increase the risk ofexposure to an STI.
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Liens utiles
- La toux La toux est une manifestation très fréquente des infections des voies respiratoires, mais elle accompagne de nombreuses autres maladies.
- Qu'est-ce que les infections urinaires ?
- nosocomiales, infections - Mécedine.
- infections sexuellement transmissibles [IST] - Mécedine.
- Les infections cutanées (TPE)