BACTERIAL INFECTIONS Flashcards
Bacterial Infections
• Spirochete diseases: Syphilis, Lyme
• Group A Streptococcus
• Rickettsia Infections
• Herpes virus infections: Infectious
• Typhoid fever
• Brucella
• Mycoplasma pneumoniae
• Helicobacter pylori
Viral Infections
• Viral Hepatitis Disease
• HIV
• Dengue
• Herpes virus infections: Infectious Mononucleosis, Epstein Barr Virus, Cytomegalovirus
Autoimmune
• Rheumatoid Arthritis
• Systemic Lupus Erythematosus (SLE)
Causative agent
Treponema pallidum subspecies pallidum
Treponema pallidum subspecies pallidum (originally called (?))
Spirochaeta pallida
neither cocci or bacilli, but spirochetes
Spirochaeta pallida
Yaws:
Treponema pallidum subspecies pertenue
Antigen
Relter strain (Non virulent variant), Nichols Strain (Virulent variant)
Relter strain (Non virulent variant), Nichols Strain (Virulent variant) Seen in
Fluorescent Treponemal Absorption Ab Test
MOT
- Sexual contact - primary
- Blood transfusion
- Trans placental route
- vertical transmission; mother to child
Trans placental route
Old names
Great pox/ Evil pox, French/Italian/Spanish Disease
(Christopher Columbus and his crew acquired syphilis in US from prostitutes which spread to UK)
Great pox
First diagnostic blood test
Wassermann test (1906)
• Aka Cardiolipin (not RPR or VDRL)
Wassermann test (1906)
Cardiolipin Principle:
Complement Fixation
Acts as an antigen or reagent that reacts w/ reagin
Cardiolipin
• Identified as phospholipid
Cardiolipin
Cardiolipin Derived from
1) host 2) beef extract
• Act as hapten
Cardiolipin
First Treatment
Arsenic, Salvarsan, Arsphenamine/606
(“magic bullet” by Paul Ehrlich)
Salvarsan
replaced by PENICILLIN (1940’s) due to Arsenic’s (?) odor
“Garlic breath”
Individuals infected with T. pallidum respond immunologically by producing both
specific and non specific ab
- Treponemal Antibodies
specific or nonspecific
Treponemal Antibodies
• produced against Ag of the organisms.
Treponemal Antibodies
Treponemal Antibodies
• Specific against:
Outer membrane protein
Endoflagellar protein
- Nontreponemal Antibodies
specific or nonspecific
nonspecific
• aka Reagin Antibodies
Nontreponemal Antibodies
- different to IgE formed against syphilis or cardiolipin
Reagin Antibodies
• aka Anti-cardiolipin/ anti-lipoidal
Nontreponemal Antibodies
• Based on RPR and VDRL
Nontreponemal Antibodies
Nontreponemal Antibodies
also produced in:
Infectious disease: Leprosy, TB, Malaria, Measles, chicken pox, IM, hepatitis
Autoimmune disorder: Rheumatoid disease
Pregnancy, old age
• Produced by patient with sphilis
Nontreponemal Antibodies
false (+) for pregnancy: use
treponemal serologic tests
CHANCRE stage
PRIMARY EARLY STAGE
Primary inflammatory lesion
CHANCRE
-Transient, painless, firm lesion at site of inoculation
portal of entry of T. pallidum
CHANCRE
-superficial ulcer with clean, firm base
CHANCRE
-highly contagious
CHANCRE
(?) chancre (painless) is present in syphilis
Soft chancre
PRIMARY EARLY STAGE
- Early:
- Post infection:
- Persists:
- Early: 10 days
- Post infection: 3-4 mos
- Persists: 1-6 weeks
PRIMARY EARLY STAGE ST
Darkfield microscopy
: Corkscrew motility
Darkfield microscopy
RPR is more sensitive than (?) and equally sensitive with (?)
VDRL
FTA ABS
90% become reactive after 3 weeks
Darkfield microscopy
best test; specific for testing T. Pallidum
Darkfield microscopy
PRIMARY EARLY STAGE ST Alternative:
RPR (more sensitive) or VDRL
-Most contagious stage
SECONDARY STAGE
-disseminated organisms
SECONDARY STAGE
CONDYLOMATA LATA
SECONDARY STAGE
LYPHADENOPATHY
SECONDARY STAGE
: maculopapular skin rash
CONDYLOMATA LATA
: inflammation of the lymph nodes
LYPHADENOPATHY
1-2 mons after appearance of primary lesion
SECONDARY STAGE
SECONDARY STAGE ST
All serological test and dark field detect the infection
Asymptomatic >4yrs: Non-communicable (except vertical transmission)
LATENT STAGE
hidden stage (no signs and symptoms)
LATENT STAGE
Healing of 2° lesions
LATENT STAGE
LATENT STAGE ST
Serological test only
Last months to years
LATENT STAGE
T or F
Not all px undergo latent stage; may proceed to tertiary stage w/o treatment
T
GUMMATA
(LATE SYPHILLIS) TERTIARY STAGE
NEUROSYPHILIS
(LATE SYPHILLIS) TERTIARY STAGE
TABES DORSALIS
(LATE SYPHILLIS) TERTIARY STAGE
CVS: Aortic Aneurysm
(LATE SYPHILLIS) TERTIARY STAGE
: nodular lesion in skin and bones lesion
GUMMATA
NEUROSYPHILIS
indications:
- general paralysis
- TABES DORSALIS
(walks sideways)
TABES DORSALIS
neurosyphilis also seen in
secondary stage (or primary)
Within 2 years or 50 years post infection
(LATE SYPHILLIS) TERTIARY STAGE
(LATE SYPHILLIS) TERTIARY STAGE ST
Best: All Serological tests
- TPI: Treponema Pallidum Immobilization Test
Treponemal Antibodies
(reference method for neurosyphillis)
TPI: Treponema Pallidum Immobilization Test
TPI: Treponema Pallidum Immobilization Test stages
secondary and tertiary
- FTA-ABS: Fluorescent Treponemal Ab
Absorption test
Treponemal Antibodies
- FTA-ABS: Fluorescent Treponemal Ab
Absorption test stages
- secondary, ter, latent
- FADH: Fluorescence Ab Darkfield Technique
Treponemal Antibodies
- FADH: Fluorescence Ab Darkfield Technique stages
- primary and secondary
- HEMAGGLUTINATION TESTS
Treponemal Antibodies
- HEMAGGLUTINATION TESTS stages
- secondary and tertiary
TPHA: Treponema Pallidum Hemaglutination
Treponemal Antibodies
MHA-P: Microhemagglutination Assay for Treponema pallidum
Treponemal Antibodies
VDRL: Venereal Disease Research Laboratory
Nontreponemal Antibodies
RPR: Rapid Plasma Reagin
Nontreponemal Antibodies
USR: Untreated Serum Reagin Test
Nontreponemal Antibodies
TRUST: Toluidine Red Unheated Serum Test
Nontreponemal Antibodies
ART: Automated Reagin Test
Nontreponemal Antibodies
microscopic
VDRL: Venereal Disease Research Laboratory
uses heat/serum inactivation to destroy complement at 56oC for 30 mins
VDRL: Venereal Disease Research Laboratory
CSF and serum
VDRL: Venereal Disease Research Laboratory
Used to diagnose neurosyphilis
VDRL: Venereal Disease Research Laboratory
widely used
RPR: Rapid Plasma Reagin
macroscopic (due to charcoal as a visualizing agent)
RPR: Rapid Plasma Reagin
Aka Modified VDRL
RPR: Rapid Plasma Reagin
No heat inactivation due to Thimerosal
RPR: Rapid Plasma Reagin
serum only
RPR: Rapid Plasma Reagin
Principle: Uses either live/dead T. pallidum to demonstrate the presence of Ab
Treponemal Antibodies
First diagnostic blood test: Wasserman
Principle: complement fixation test
Treponemal Antibodies
Confirmatory tests
Treponemal Antibodies
Principle: Nontreponemal Abs/ Reagin + Colloidal suspension of Lipoids = FLOCCULATION
Nontreponemal Antibodies
Screening tests
Nontreponemal Antibodies