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What are sexually transmitted infections?
Sexually transmitted infections (STIs),
also known as sexually-transmitted diseases (STD) or venereal
diseases (VD), are infections that can be transmitted through
sexual intercourse. Bacteria, viruses, fungi or protozoa
can cause these infections.
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What are the different types of STI?
What are the agents causing these STIs?
- The STIs caused by bacteria include
- Syphilis - Treponema pallidum
- Gonorrhoea - Neisseria gonorrhoeae
- Non-gonococcal urethritis -
- Chlamydia trachomatis
- Ureaplasma urealyticum
- Mycoplasma genitalium
- Chancroid - Haemophilus ducreyi
- Lymphogranuloma venereum (LGV) - Chlamydia
trachomatis
- Granuloma inguinale - Calymmatobacteria
granulomatis
- The STIs caused by viruses include:
- Genital herpes - herpes simplex virus type
1 & 2
- Genital warts - human papilloma virus
- Viral Hepatitis - hepatitis A, B and C
viruses
- AIDS/HIV infection - human immunodeficiency
virus type 1 & 2
- Molluscum contagiosum - molluscum contagiosum
virus
- The STIs caused by fungi include:
- Vaginal candidiasis - candida albicans
- The STIs caused by protozoa include:
- Trichomoniasis - trichomonas vaginalis
- The STIs caused by parasites include:
- Scabies - sarcoptes scabiei
- Pubic lice infestation - pediculosis pubic
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What are the
common types of STI?
The common STIs are:
Non-gonococcal urethritis (NGU)
Syphilis
Chlamydia infections
Gonorrhoea
Genital herpes
Genital warts
AIDS/HIV infection
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How are STIs
transmitted?
STIs are transmitted through sexual intercourse
or close body contact with another person who is infected
with an STI. Transmission of some STIs e.g. NGU, HIV, Hepatitis
B and gonorrhoea occurs when there is transfer of body fluids
(e.g. semen from the male genital tract or vaginal and cervical
secretions from the female genital tract) from an infected
person to the sex partner. Transmission of other STIs, e.g.
scabies, pubic lice, syphilis, herpes and warts occurs when
there is intimate skin-to-skin contact. Some STIs e.g. syphilis,
hepatitis B and HIV may be transmitted from an infected mother
to her baby during pregnancy or delivery. These infections
may also be transmitted through sharing of injection needles
or through contaminated blood transfusions.
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Are STIs transmitted
through sharing of food, utensils, toilet seats or through
handshakes?
No. STIs cannot be transmitted through sharing
of food or eating utensils, shaking hands, through toilet
seats or swimming pools. The organisms causing STIs usually
cannot survive outside the human body.
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Can STIs be
contracted through kissing?
Dry kissing is generally safe. Some STIs can be
transmitted through deep, wet kissing. Syphilis, gonorrhoea,
chamydial infection, and herpes may be present in the mouth/throat
of infected persons. However, STIs are not commonly transmitted
through kissing.
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Can a person
be infected with more than one STI?
Yes this is possible and not uncommon. This is
why it is always important to be tested for other STIs if
you have been diagnosed as suffering from any one STI.
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Can someone
inherit an STI from his or her parents, i.e. is it genetic
disease?
STIs are acquired diseases; they are not inherited.
However, mothers with some STIs can pass on the infection
to their baby during pregnancy, during delivery or breastfeeding.
Early treatment of an infected pregnant mother can prevent
infection in her baby.
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What are the
common symptoms and signs of STIs?
STIs may present in a number of ways. The commonest
symptoms of STI are:
- Genital discharge (from the urethra or the vagina)
- Dysuria (pain on passing urine)
- Genital sores or ulcers (these may be painful or painless)
- Blisters on genitals
- Growths on genitals
- Swelling of lymph glands (in the groin)
- Rash on genitals and other parts of the body
- Sometimes an infection can present in the absence
of any symptoms or signs -
This is called an asymptomatic infection
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Do these symptoms
and signs occur only in STIs?
Not necessarily. Rashes and growths on genitals may be
signs of conditions that are not sexually-transmitted. Similarly
not all discharges and dysuria are due to STIs. You should
consult your doctor if you develop these symptoms and signs.
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How long does
it take for the symptoms and signs of STIs to appear after
infection?
The incubation period is the period of time from
infection to the appearance of symptoms and signs; it can
vary according to the type of STI. Some infections such as
gonorrhoea, non-gonococcal urethritis (NGU) and genital herpes
have short incubation periods, ranging from 2 days to 3 weeks.
The incubation period of other STIs such as syphilis may range
from 2 weeks to many months, and that for HIV infections may
be several years.
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What must you
do if you suspect that you have contracted a STI?
See a doctor immediately. Avoid sex as you may pass on an
infection. Do not self-medicate. |
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How soon should
you see a doctor after having sex with a stranger?
You should see a doctor as soon as you notice any
of the symptoms and signs of STI. If none of the symptoms
or signs occurs, blood tests for syphilis and HIV should be
carried out after about 4 weeks. Your doctor should be able
to provide further advice or order other tests. Do refrain
from unprotected sexual intercourse until the doctor has given
you the all clear. Do not self-medicate as this is usually
ineffective and may lead to complications. |
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What will happen
to the symptoms and signs of various STIs if you do not seek
treatment?
In some cases, the symptoms and signs of the STI
may disappear even without treatment. This however does not
mean that the infection is cured. Even if you do not have
any symptoms or signs, the infection may still be present
and may spread to the other parts of the body. The organisms
may begin to invade the internal organs and cause irreversible
damage. |
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Can a person
with STI not have any symptoms or signs?
Certainly. All STIs are symptomless during the
incubation period. More than 10% of males, more than half
of females with gonorrhoea and chlamydia trachomatis infection
do not show any symptoms or signs. Asymptomatic STIs are also
more common in individuals who are incorrectly treated i.e.
who have self-medicated with antibiotics or those who did
not follow prescribed antibiotic treatment. Individuals with
an asymptomatic STI can still transmit the infection to their
sexual partners. |
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Are all STIs
curable? Why do I need to seek early treatment for STIs?
Bacterial STIs are curable if treated early. Early
treatment of an STI prevents transmission to others and also
prevents complications. Most viral STIs however are not curable. |
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Can all STIs
be diagnosed or confirmed by blood tests?
Blood tests are useful only for
a few STIs. These include syphilis, hepatitis B infection
and AIDS/HIV infection.
For the other STIs, examination of specimens
from the discharge and samples from the skin and mucous
membranes are used to confirm diagnosis.
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How are STIs
treated?
Different STIs are treated differently. Those caused
by bacteria are treated with antibiotics; those caused by
viruses with antiviral drugs; and those caused by parasites
with antiparasitic drugs. There is no single medication that
can treat and cure all STIs. It is therefore important to
identify the type(s) of STI before treatment. |
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Can a person
take antibiotics before sex to prevent STI?
No. Oral antibiotics before sex or after sex are
not useful. Different STIs require different antimicrobial
medications. Antimicrobials taken before sex as a preventive
measure may actually mask the symptoms and signs of infection
in an infected person, he or she is still carrying the infection.
Preventive antimicrobials will also promote the development
of resistant organisms. STIs caused by resistant organisms
are more difficult to cure. The only recommended prophylaxis
against STI before sex is a condom.
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Can a person
be immunized against STIs? Does a person develop immunity
to a STI once he is cured of the infection?
With the exception of hepatitis B infection, no vaccines
are currently available for use to prevent STI. And with the
exception of hepatitis B infection, a person can be infected
repeatedly despite having been cured of an STI.
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