Microbiology: Cooties Flashcards
Legionella morphology
Gram negative bacilli
Legionella spread to humans
Inhalation
How do legionella survive in plumbing
Survives on bacterial biofilms
Host factors predisposing to Legionella
Smoking, chronic lung dx, old, immunosuppression
legionella in lungs are ingested by _____
Alveolar macrophages
Legionella pneumophila in macrophage is enveloped by _____. (Organelle)
Endoplastic reticulum
Steps to legionella replication
1) Eaten by macrophage
2) Enveloped by ER
3) If enough nutrients, differentiates into replicative form.
4) Switch to transmissible form w/ flagella
5) Host cell lysis
Features of L pneumophila transmissible form
-Express cell lysis factors
-Flagella
-Resistant to osmotic shock
-Inhibit phagosome/lysosome fusion
L pneumophila virulence factors
Chitinase (via type II secretion)
Proteins that target Rab1 GTPase
Factor that inhibits intracellular growth of bacteria
TNF-α
Patients on Anti-TNF-α agents are suceptible to
Legionella
How does γ-interferon suppress intracellular cell growth
Stimulates iron sequestration from bacteria
L pneumophila lung damage progression
Infected macrophages release cytokines which recruit monocytes and neutrophils
Nodules and microabesses form and sometimes coalesce
Legionnaire’s symptoms
Begins flu-like, progresses to pneumonia.
Tests for Legionella
Urine enzyme immunoassay (misses half)
PCR amplification of 16s DNA
Culture
Legionella treatment
Macrolides and fluroquinolones
Why are beta lactams not effective on legionella
Dont penetrate eukaryotic cells
Infection from contaminated potting soil in Aus/NZ
Legionella longbeachae
Pontiac fever features
L pneumophila causes fever, muscle aches and headaches that spontaneously resolved.
H. Pylori morphology
Gram negative, flagellated spirochete
H pylori cancers caused
MALT lymphoma
Adenocarcinoma (more common)
H Pylori virulence/adherence
Adherence: BabA SabA
Virulence: CagA
H pylori factor that modulates and suppresses home immune response
VacA
H Pylori tripple therapy
Clarithromycin
Amoxicillin
PPI
Why does mycobacteria stain acid fast (what component of membrane?
Mycolic acid
Mycobacterium anerobic/aerobic?
Obligate aerobe
Clinical manisfestations of TB are a result of _____
Host immune response
Symptoms of tuberculosis are due to (factors )
Macrophages secreting IL-1 and TNF-α
Where does primary TB occur (and what happens)
Middle lung
Ghon complex: lung inflammation with enlarged hylar lymph nodes
Describe miliary tuberculosis
Seen in immunocomopromised… it is a disseminated infection
TB affecting bones aka
Pott’s disease (osteomyelitis)
Lepromatous leprosy characterized by a _____ response
Weak TH1 response. TH2 is predominant
Vaccine for TB and leprosy (what type?)
BCG (live attenuated)
Bartonella henslea, quinata, bacilliformis transmission vectors
Henselae: Cat
Quinata: Human/Louse
Bacilliformis: Sandfly
Bartonella henselae symptoms
Small papule at site of innoculation, travels via lymph
Bratonella in AIDS
Freely disseminates in body to cause blood vessel malformations. Attach to RBCs
Major bartonella disease progression (and how?)
Bacilllary angiomatosis
Bartonella agar
Wathrin-Starry sky
Bartonella heart issue
Culture negative endocarditis
Bartonella Quintana lifecycle and presentation
Enters erythrocytes to replicate
Relapsing fever w/o anemia
Bartonella bacilliformis life and presentation
Attaches to erythrocytes, deforms cell membrane to enter and multiplies in cytoplasm. Causes massive anemia
Bartonella treatments
Doxy, azithromcyin, erythromycin
Chlamydia energy requirement
Cannot make own ATP need from cell
Chlamydia serotypes normally causing blindness
A-C cant see
Chlamydia STD serotype
D-K dick
Chlamydia STD progression
Moves up endometrium and fallopian tubes. Reactive arthritis
Cant see cant pee cant climb tree: reiters syndrome
Chlamydia serotype that goes into lymph
L1-L3
Chlamydia pneumonia histo
Atherosclerosis of plaques
Chlamydia pneumonia type
Interstitial
Parrot fever Pneumonia bug
C. Psittaci
Chlamydia infectious form aka
Elementary body
Outer membrane of chlamydia has
Cysteine residue
How does chlmaydia enter cell
Taken up in endosome, escapes fusion with lysosome
Dividing form of chlamydia aka
Reticulate body
How does chlamydia cause ectopic pregnancy
By damaging fallopians -> egg gets stuck
Reactive arthritis commonly seen in ____ allelle
HLA B27
Chlamydia secretion system type
Type 3
Rickettsia rickettssii presentation
Rocky mountain spotted fever
Headache and vasculitis w/ rash
Rickettsia rickettssii spread by
Dermacentor tick
Rickettsia rickettssii enters cell and spreads via
Actin filaments
Rickettsia life cycle
Obligate intracellular, can make ATP and also steal it
Rickettsia rickettssii infects (cell layer)
Endothelium