-
Syphilis is caused by a spirochete bacteria called what?
Treponema Pallidum
-
direct examination of treponema is performed with:
darkfield microscopy
-
what type of motility does T. pallidum have?
corkscrew motility
-
T. Pallidum has _ to __ coils that are _ to __ um long.
-
true or flase
T. Pallidum is not grown on cultivated media
ture
-
this varient of T. pallidum is found in eastern Mediterranean, the Balkans and cooler areas of North Africa.
Bejel
-
this disease is caused by T. pertenue and is found in the carribean, latin america, central africa and the far east.
Yaws
-
This disease is caused by T. carateum and found in latin america, and infection is limited to skin.
Pinta
-
what is the name of the lesion that develops at the point of inoculation in syphilis.
Chancre
-
how often is the Chancre located around the genitalia?
90% of the time
-
Chancre will persist for ______ weeks and will be healed in _______ weeks.
-
how long after the appearance of the chancre does symptoms of secondary syphilis occur.
2-8 weeks
-
Secondary syphilis has symptoms of a _________ _________.
General Illness
-
in what stage of syphilis does lyphadenopathy and skin lesions on the hands and feet occur.
secondary
-
secondary syphilis will resolve itself in how many weeks even without treatment?
2-6 weeks
-
Latent syphilis occurs when.
two to four years of infection
-
after four years of latency _______ are rare.
relapses
-
this stage of syphilis is characterized by the presence of destructive granulomas called gummas.
Tertiary (Late) syphilis
-
in what stage of syphilis do spirochetes involve brain tissue causing paresis, personality changes, dementia, and delusional states.
Tertiar (late)
-
this is caused by maternal spirochetemia and transplacental transmission of microorganism.
congenital syphilis
-
late congenital syphilis may manifest what two signs and symptoms?
- interstitial keratitis
- nerve deafness
-
saddle-nose deformity is seen in what type of syphilis.
congenital syphilis
-
these tests are designed to detect Reagin, an antibody-like substance.
non-treponemal Tests
-
this is a carbon particle antigen used to detect the presence or reagin.
cardiolipin
-
what are the two nontreponemal tests?
- Rapid Plasma Reagin (RPR)
- Venarial Disease Research Lab (VDRL)
-
these are used to confirm a reactive non treponemal test.
Treponemal Test
-
Treponemal tests are used to detect the presence of what?
T. Pallidum antibiotics
-
Treponemal tests use what to detect T. pallidum antibodies?
killed T. pallidum
-
what are the two treponemal tests?
- fluorescent treponema pallidum antibody absorption (FTA-ABS)
- microhemagglutination treponema pallidum (MHA-TP)
-
in RPR if reagin is present __________ occurs
flocculation
-
what is the minimum amount of serum needed to perform an RPR test?
2ml
-
how are RPR specimens stored?
2-8oC
-
how long is unopened RPR antigen stable for?
12 Months
-
how long is opend RPR antigen stable for if refrgerated at 2-8oC.
3 months or untill expiration date
-
what gauge needle is used to perform RPR testing?
18 guage without bevel
-
The needle used for RPR should deliver what amount of antigen per mL.
60gtts +/- 2gtts
-
what quantity of serum do the RPR Dispenstirs delvier?
0.05ml or 50ul
-
At what speed should the rotator rotate if performing RPR testing.
100 RPM
-
what three things should be performed prior to RPR testing?
- Controls
- Calibrate the needle
- Calibrate the rotator
-
medium to large agglutination in an RPR result is called ________.
reactive
-
no agglutination in an RPR result is considered _________.
non-reactive
-
slight agglutination in RPR result is considered __________.
minimal reactive
-
in what test is a patient's serum heat inactivated and mixed with a buffered saline suspension of cardiolipin-lecithin-cholesterol antigen.
VDRL
-
in VDRL how is the mixture examined for flocculation.
microscopically
-
what is the rotator speed when performing VDRL?
180 RPM
-
This is the most sensitive serological procedure in the detection of primary syphilis.
FTA-ABS
-
FTA-ABS has ____ sensitivity in diagnosing tertiary (late) syphilis.
95%
-
in FTA-ABS a patient's heat inactivated serum is allwed to react with an extract of ___________ that has been fixed to the slide
T. pallidum
-
How is serum heat inactivated?
- heat at 56oC for 30 minutes
- 10 min if inactiveated more than four hours ago
-
what is added to slide so the antigen antibody reaction is visible in FTA-ABS?
Fluorescent Anti-Human Globulin (AHG)
-
what does AHG bind with if the FTA-ABS reaction is present?
binds to the antibody
-
If T. pallidum antibodies are present in FTA-ABS, what will the slide look like?
the slide will fluoresce or glow when viewed under a fluorescent microscope
-
in what test are red blood cells sensitied with T. pallidum?
microhemagglutination treponema pallidum (MHA-TP)
-
in MHA-TP, if antibody is present, it will bind to antigens causing what?
agglutination.
-
if positive what will be the appearance of the micro-dilution well in MHA-TP?
agglutinated particles will spread evenly in the well.
-
if negative what will the appearance of an MHA-TP sample be?
non agglutinated particles will be in a button at the bottom of the well.
|
|