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What is chlamydia?
- Chlamydia is the most frequently reported sexually
transmitted disease (STD).
- It is caused by
the bacteria
Chlamydia trachomatis.
- Women can be
reinfected after treatment if their sex partners are not
treated. Reinfections place women at higher risk for serious
reproductive health complications, including infertility.
- Many people who are at risk of
chlamydia infection don’t know what it is, or understand it,
even if they are aware of the name.
how common is Chlamydia infection?
In the U.S. an estimated 2.8 million Americans get
chlamydia each year. Chlamydia is
the most common STI in the UK. It affects both sexes,
although young women are more at risk.
How do you get chlamydia?
- Sexually active women and men can get chlamydia through
sexual contact with an infected person. The more sex
partners a person has, the greater the risk of
getting infected with chlamydia.
- Chlamydia can be
passed during vaginal, anal, or oral sex.
- As there are often no
symptoms, people who are infected
may unknowingly pass chlamydia to their sex partners.
- An infected mother can also pass chlamydia to her baby
during childbirth. Babies born to infected mothers can get
pneumonia or infections in their eyes, also called
conjunctivitis. Blindness may ensue.
- Chlamydia can easily
confused with gonorrhea, another STD. Gonorrhea and
chlamydia have similar symptoms and can have similar
complications if not treated, but these two STDs have
different treatments.
Recommended Books:

The Official Patient's Sourcebook on Chlamydia: A Revised and Updated Directory for the Internet Age
What are the symptoms of chlamydia?
Chlamydia is known as a "silent" disease because 75
percent of infected women and at least half of infected men
have no symptoms. Infection may
only be diagnosed once chlamydia has led to complications -
when treatment can sometimes be too late to stop permanent
damage. If symptoms do occur, they usually appear
within 1 to 3 weeks of exposure. The infection first attacks
the
cervix and
urethra.
Early symptoms can include:
- an abnormal vaginal discharge
- dysuria, a burning sensation when urinating. Even if
the infection ascends from the cervix to the uterus and
fallopian tubes,
some women may still have no signs or symptoms.
Later symptoms can
include:
- lower abdominal pain
- low back pain
- nausea
- fever
- dyspareunia (pain during sex)
- inter-menstrual bleeding - bleeding between
menstrual periods
- post-coital bleeding
- Infertility. Chlamydia is the most common
preventable cause of infertility in women. When
the Fallopian tubes are blocked, no pregnancy is
possible naturally. One option is IVF (in-vitro
fertilisation), but availability on the NHS is
patchy and has variable success rates.
As symptoms
do not always occur, the infection is often not diagnosed or
treated until complications have occurred.
If you go to a GP or family
planning doctor with these symptoms, make sure you have a
chlamydia test. You are entitled to ask for the chlamydia
test if you aren't offered it.
Men with symptoms might have a discharge from the penis
and a burning sensation when urinating. Men might also have
burning and itching around the opening of the penis or pain
and swelling in the testicles, or both. The bacteria also
can infect the throat from oral sexual contact with an
infected partner.
What health problems can result from untreated
chlamydia?
If untreated, chlamydia infection can cause serious
reproductive and other health problems. Like the disease
itself, the damage that chlamydia causes is often "silent."
As chlamydia is a sexually transmitted disease, those who
are at risk may develop other infections such as gonorrhea,
syphilis and HIV/AIDS.
In women, the chlamydia bacteria often infect the cells
of the cervix. If not treated, the infection can spread into
the uterus, fallopian tubes, and ovaries and cause
pelvic inflammatory disease
(PID). This happens in up to 40 percent of women with
untreated chlamydia. PID can cause:
-
Infertility. This is the inability to
get pregnant. The infection causes inflammation
of the fallopian tubes, which become blocked,
keeping eggs from being fertilized.
- Chlamydia
infection can affect sperm function and male
fertility. It is the most common cause of
inflammation in the testicles and
sperm-conducting tubes (epididymo-orchitis) in
men under the age of 35. This causes pain,
swelling and redness on the affected side of the
scrotum, or on both sides.
- An ectopic
or tubal pregnancy. This means that a
fertilized egg starts developing in the
fallopian tube instead of moving into the
uterus. This is a dangerous condition that can
be potentially lethal.
- Chronic
pelvic pain.
Untreated chlamydial infections can also cause
inflammation of the bladder. In men having anal sex with a
partner who has chlamydia, the bacteria can cause proctitis,
which is an infection of the lining of the rectum. Untreated
chlamydia in men typically causes infection of the urethra,
the tube that carries urine from the body. Infection
sometimes spreads to the tube that carries sperm from the
testis. This may cause pain, fever, and even infertility.
In pregnant women, chlamydia infections may lead to
premature delivery. Babies born to infected mothers can get
infections in their eyes, called conjunctivitis or pinkeye,
as well as pneumonia. Symptoms of conjunctivitis include
discharge from the eyes and swollen eyelids, usually showing
up within the first 10 days of life. Symptoms of pneumonia
are a cough that steadily gets worse and congestion, usually
showing up within three to six weeks of birth. Both of these
health problems can be treated with antibiotics.
How is chlamydia diagnosed?
Only a doctor or nurse can diagnose chlamydia. There are
laboratory tests to diagnose chlamydia. Some tests involve
getting a sample from an infected site (cervix or penis) to
be tested for the bacteria. Blood tests for chlamydia may
show antibodies indicating past infection. A
Pap test is
not a test for chlamydia.
Who should get tested for chlamydia?
Women should consider having a test
for chlamydia if they:
- Have new or multiple sex partners
- Have sex with someone who has other
sex partners
- Do not use condoms during sexual
activity within a relationship that is not mutually
monogamous, meaning their sex partners have sex with
other people
- If you have unusual vaginal discharge, burning with
urination, or other symptoms listed above, and you are at
risk of sexually transmitted disease
What is the treatment for chlamydia?
If you think you have chlamydia or are concerned about
it, both you and your sex partner should see a doctor.
Antibiotics are used to treat and cure chlamydia. It is one of the more common of the sexually transmitted diseases. Chlamydia are sensitive to antibiotics including erythromycin and the tetracyclines.
A single dose of azithromycin or a week of
doxycycline are the most commonly used treatments. All
sex partners should also be treated to avoid reinfection.
You should not have sex until you and your sex partner(s)
have finished treatment. Erythromycin is a safe antibiotic to cure
chlamydia during pregnancy.
What should I do if I have chlamydia?
Chlamydia is easily treated, but it’s important for you
to seek testing as soon as you think you could be at risk. By seeking
testing and getting treated, you are taking good care of
your reproductive health. If you have chlamydia:
- Get it treated right away. Visit a clinic, doctor,
or nurse.
- Follow your doctor’s orders and finish all the
medicine that you are given. Even if the symptoms go
away, you still need to finish all of the medicine.
- Avoid having any sexual activity while you are being
treated for chlamydia.
- Tell your sexual partners, so they can be treated
too.
- Get a follow-up test three to four months after
treatment to make sure that the infection has not recured.
- See your doctor again if your symptoms do not
disappear within one to two weeks after finishing the
medicine.
- See your doctor again within 3 to 4 months for
another chlamydia test, especially if your sex partner
was not treated or if you have a new sex partner.
Doctors, local health departments, and STD and family
planning clinics have information about STDs and can give
you a test to find out if you have chlamydia. Don’t assume
your doctor will automatically test you for chlamydia – you
can take care of yourself, though, by asking about chlamydia
and requesting a test.
How can chlamydia be prevented?
There are things you can do to lower your risk for
getting chlamydia:
- Don’t have sex. The best way to
prevent chlamydia or any STD is to practice abstinence,
or not having vaginal, anal, or oral sex.
- Be faithful. Have a sexual
relationship with one partner who has been tested for
chlamydia and is not infected is another way to reduce
your chances of getting infected. Be faithful to each
other, meaning that you only have sex with each other
and no one else.
- Use condoms. Condoms can lower the
risk of passing chlamydia, so protect yourself with a
condom EVERY time you have vaginal, anal, or oral sex.
Condoms should be used for any type of sex with every
partner. For vaginal sex, use a latex male condom or a
female polyurethane condom. For anal sex, use a latex
male condom. For oral sex, use a dental dam. A dental
dam is a rubbery material that can be placed over the
anus or the vagina before sexual contact.
- Know that some methods of birth control,
like birth control pills, shots, implants, or
diaphragms, will not protect you from STDs. If
you use one of these methods, be sure to also use a
latex condom or dental dam (used for oral sex) correctly
every time you have sex.
- Learn the symptoms of chlamydia.
But remember that chlamydia often has no symptoms. Seek
medical help right away if you think you may have
chlamydia or another STD.

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