Human Biology (STI's) Flashcards
What is an STI?
Infections that are transmitted by close body contact, usually with the genital organs.
What are STI’s caused by?
Viruses, bacteria, fungi or parasites that are passed from an infected person to a partner during sexual activity.
Most STi’s have a vaccine true or false?
False.
What is chlamydia caused by and how is it transmitted?
A highly specialised bacterium, Chlamydia trachomatis.
Chlamydia trachomatis is transmitted by vaginal or anal sex with an infected person. Both men and women may be infected, and it occurs mostly in people aged under 25 years.
What infection may men develop and what are the symptoms for Chlamydia?
Men may develop an infection of the urethra known as nonspecific urethritis (NSU), which has the symptoms of a yellow, mucus-like discharge from the penis and a burning sensation when passing urine.
If untreated the bacterium can spread to the epididymis, causing epididymitis (pain and swelling).
What symptoms are present in women for Chlamydia?
Most infected women have no symptoms. This makes the disease very dangerous, because if untreated it can lead to infertility, eye infection and arthritis. Some women show symptoms of pelvic inflammatory disease (PID), which is inflammation of the organs in the pelvic region such as the uterus and uterine tubes. Continual inflammation of the uterine tubes may lead to blockage by scar tissue, and thus to infertility.
What is an ectopic pregnancy and when could this occur?
Implantation of an embryo outside the uterus – an ectopic pregnancy – may also occur if a woman is infected with chlamydia. If the infected woman is pregnant, there is a 70% chance that the disease will be passed to the foetus during birth
How is chlamydia treated and diagnosed?
urine test can be done in males and in females.
swab from the vagina, cervix, anus or penis.
If infection by Chlamydia is confirmed, the usual treatment is a course of antibiotics, although even with prolonged treatment the bacterium may never be completely eliminated from the body.
What is Gonorrhoea?
An infectious disease that mainly affects the mucous membranes of the excretory and reproductive systems, the rectum, and occasionally the eyes and throat.
What is Gonorrhea caused by?
Caused by a bacterium, Neisseria gonorrhoeae, that is transmitted during sexual intercourse. The disease affects both males and females,
symptoms appear about 2–10 days after infection, although in females these may not be recognised.
What is incubation period?
The period between infection and the appearance of symptoms
What are the symptoms of Gonorrhea in males?
the bacterium enters the urethra during intercourse with an infected partner. After the incubation period, inflammation in the urethra results in a burning feeling in the penis and extreme pain when passing urine. Later, there is a yellow discharge of pus from the penis. If untreated, the urethra may become permanently constricted, resulting in difficulty in urinating. If untreated, the infection can spread to other organs of the body, such as to the testes, causing eventual sterility; to the joints, causing a type of arthritis; or to the heart or eyes.
What are the symptoms of Gonorrhea in females?
In females, the disease is sometimes considered more serious, as there may be no early symptoms, or the symptoms may go unrecognised in more than 70% of infected women. Bacteria enter the vagina during intercourse with an infected male. In most cases, the urethra or cervix are infected. A woman may have the disease for months before pain causes her to seek medical treatment. Untreated, the infection spreads to the oviducts and to the abdominal membranes. Oviduct infection may cause permanent blockage and thus infertility.
What are the treatments of Gonorrhea
Antibiotics are used in the treatment of gonorrhoea and normally result in an easy and effective cure, provided treatment is begun early enough. However, strains of gonococcus that are resistant to antibiotics have evolved and in some cases are becoming increasingly difficult to cure.
What is Syphilis caused by?
Syphilis is caused by a thin, flexible, spiral-shaped bacterium, Treponema pallidum. The disease is normally contracted by direct sexual contact and affects men and women in the same way.
What is the primary stage of Syphilis?
Primary stage:
syphilis bacterium enters through any small break in the skin during sexual activity with an infected person, then
multiplies and spreads through the whole body ranging from 10 days to 10 weeks.
What is the secondary stage of Syphilis?
Secondary stage:
usually follows a few weeks after the primary stage, but may be delayed for up to 12 months.
Possible symptoms include skin rashes, sore or ulcerated mouth or throat, mild fevers, and disorders of the bones or eyes.
The patient is highly infectious during this stage, which lasts for about 2 years.