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Sexually-transmitted diseasesSexually-transmissible infections (STIs) are infectionsthat have a significant probability of transmission between humans by means of sexual contact–vaginal intercourse, oral sex, and/or anal sex.
Classification and terminologyThey were commonly known as venereal diseases (VD); Veneris is in Latin the genitive(possessive) form of the name Venus, the Roman goddessof love) until some time around 1990, when public health officials introduced newer terms such as sexually-transmitted disease in efforts to improve the clarity of their warnings to the public. Today the term sexually-transmissible infection is favored over sexually-transmitted disease as the latter is more restrictive in consideration that there are other means of transmission. For instance, meningitisis transmissible by means of sexual contact but is not labeled as an STI because sexual contact is not the primary vectorfor the pathogensthat cause meningitis. This discrepency is addressed by the probability of infection by means other than sexual contact. In general, an STI is an infection that has a negligible probabililty of transmission by means other than sexual contact, but has a realistic means of transmission by sexual contact (more sophisticated means–blood transfusion, sharing of hypodermic needles–are not taken into account). Thus, one may presume that, if a person is infected with an STI (e.g., chlamydia, gonorrhea, genital herpes), it was transmitted to him/her by means of sexual contact. Humans are more susceptible to transmission of infection by means of sexual contact for two main reasons:
When both factors are considered, the probability of transmission of infection is far higher than by other means of transmission (non-sexual contact–touch, sharing cutlery, shaking hands). Although STD and STI are most often used interchangeably, some make distinctions between the two. As quoted from http://www.etharc.org, "Sometimes the terms STI and STD are used interchangeably. This can be confusing and not always accurate, so it helps first to understand the difference between infection and disease. Infection simply means that a germ ? virus, bacteria, or parasite ? that can cause disease or sickness is present inside a person?s body. An infected person does not necessarily have any symptoms or signs that the virus or bacteria is actually hurting their [sic] body (they do not necessarily feel sick). A disease means that the infection is actually causing the infected person to feel sick, or to notice something is wrong. For this reason, the term STI ? which refers to infection with any germ that can cause an STD, even if the infected person has no symptoms ? is a much broader term than STD." The distinction being made, however, is closer to that between a colonization and an infection, rather than between an infection and a disease. The term STD refers only to infectionsthat are causing symptomsor problems. Because most of the time people don?t know that they are infected with an STD until they start showing symptoms of disease, most people use the term STD, even though the term STI is also appropriate in many cases. Depending on the STD, a person may or may not still be able to spread the infection if no signs of disease are present. For example, a person is much more likely to spread herpesinfection when blistersare present (STD) than when they are absent (STI). However, a person can spread HIVinfection (STI) at any time, even if he/she has not developed symptoms of AIDS(STD).</i>" All sexual behaviorsthat involve contact with another person or the bodily fluids of another person should be considered to contain some risk of transmission of sexually-transmitted diseases. Most attention has focused on controlling HIV, which causes AIDS, but each STD presents a different situation. As may be noted from the name, sexually-transmitted diseases are transmitted from one person to another by certain sexual activities rather than being actually caused by those sexual activities. Bacteria, fungi, protozoaor virusesare still the causative agents. It is not possible to catch any sexually-transmitted disease from a sexual activity with a person who is not carrying a disease; conversely, a person who has an STD got it from contact (sexual or otherwise) with someone who had it, or his/her bodily fluids. Although the likelihood of transmitting various diseases by various sexual activities varies a great deal, in general, all sexual activities between two (or more) people should be considered as being a two-way route for the transmission of STDs (i.e., "giving" or "receiving" are both risky). Healthcare professionals suggest safer sex, such as the use of condoms, as the most reliable way of decreasing the risk of contracting sexually-transmitted diseases during sexual activity, but safer sex should by no means be considered an absolute safeguard. Abstinence from sexual activities involving other people will protect against sexual transmission of sexually-transmitted infections; however, it must be noted that STDs can also be transmitted through other activities involving transfer of and exposure to bodily fluids, such as blood transfusionsand other blood products, sharing injection needles, needle-stick injuries (when medical staff are inadvertently jabbed or pricked with needles during medical procedures), sharing tattooneedles, and childbirth. These means of transmission make certain groups, such as doctors, haemophiliacsand drug users, particularly at risk. Recent epidemiologicalstudies have investigated the networks that are defined by sexual relationships between individuals, and discovered that the properties of sexual networksare crucial to the spread of sexually-transmitted diseases. In particular, assortative mixingbetween people with large numbers of sexual partners seems to be an important factor. Since prostitutes tend to have large numbers of sexual partners, prostitutionwithout the use of safer-sex precautions has often been associated with the spread of sexually-transmitted diseases. Some travellers such as truck driversand sailorsalso often have high numbers of sexual partners (often prostitutes). However, sexually-transmitted diseases are potentially transmitted in any form of sexual relationship, so it is important that all members of the community that are engaged in sexual relationships use safer-sex precautions, regardless of the nature of their relationships. It is possible to be an asymptomaticcarrier of sexually-transmitted diseases. In particular, sexually-transmitted diseases in women often cause the serious condition of pelvic inflammatory disease. TreatmentImage:SheMayLookCleanBut.jpg Image:Stdspain.jpg Sexually-transmitted diseases have been well-known for hundreds of years — the English language has short words for two of the most common: the "pox" (syphilis) and "the clap" (gonorrhea). Prior to the invention of modern medicines, sexually-transmitted diseases were generally incurable, and treatment was limited to treating the symptoms of the disease. The first venereal diseases clinic opened on January 31, 1747at London Dock Hospital. The first effective treatment for a sexually-transmitted disease was salvarsan, a treatment for syphilis. With the discovery of antibiotics, a large number of sexually-transmitted diseases became easily curable, and this, combined with effective public health campaigns against STDs, led to a public perception during the 1960s and 1970s that they had ceased to be a serious medical threat. During this period, the importance of contact tracingin treating STIs was recognized. By tracing the sexual partners of infected individuals, testing them for infection, treating the infected and tracing their contacts in turn, STI clinics could be very effective at suppressing infections in the general population. In the 1980s, first genital herpesand then AIDSemerged into the public consciousness as sexually transmitted diseases that could not be cured by modern medicine. AIDS in particular has an asymptomatic period, which allowed the disease to be spread to others, followed by a symptomatic period, which leads rapidly to death unless treated. Recognition that AIDS threatened a global pandemicled to public information campaigns and the development of treatments that allow AIDS to be managed by suppressing the HIV virus for as long as possible. Contact tracing continues to be an important measure, even when diseases are incurable, as it helps to contain infection. Current STD Treatment (Cure) Types and their pathogenic causesNote: All of the diseases on this list can be transmitted sexually. Some of the diseases on this list are commonly transmitted in other ways besides sexually; for example, HIV/AIDSis also commonly transmitted through the sharing of infected needles by drug users, and candidiasis, while it can be sexually transmitted, is very often not associated with sexual activity. Bacterial
Viral
Parasites
Fungal
Protozoal
See also
External links
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